231 (number)

Last updated
← 230 231 232 →
Cardinal two hundred thirty-one
Ordinal 231st
(two hundred thirty-first)
Factorization 3 × 7 × 11
Greek numeral ΣΛΑ´
Roman numeral CCXXXI
Binary 111001112
Ternary 221203
Senary 10236
Octal 3478
Duodecimal 17312
Hexadecimal E716

231 (two hundred [and] thirty-one) is the natural number following 230 and preceding 232.

Two hundred [and] thirty-one 231 = 3·7·11, sphenic number, triangular number, doubly triangular number, hexagonal number, octahedral number, [1] centered octahedral number, [2] the number of integer partitions of 16, Mertens function returns 0, [3] and is the number of cubic inches in a U.S. liquid gallon.

Related Research Articles

85 (eighty-five) is the natural number following 84 and preceding 86.

31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number.

114 is the natural number following 113 and preceding 115.

1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.

300 is the natural number following 299 and preceding 301.

400 is the natural number following 399 and preceding 401.

500 is the natural number following 499 and preceding 501.

700 is the natural number following 699 and preceding 701.

600 is the natural number following 599 and preceding 601.

800 is the natural number following 799 and preceding 801.

900 is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10 it is a Harshad number. It is also the first number to be the square of a sphenic number.

2000 is a natural number following 1999 and preceding 2001.

3000 is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English.

5000 is the natural number following 4999 and preceding 5001. Five thousand is the largest isogrammic number in the English language.

7000 is the natural number following 6999 and preceding 7001.

8000 is the natural number following 7999 and preceding 8001.

235 is the integer following 234 and preceding 236.

232 is the natural number following 231 and preceding 233.

20,000 is the natural number that comes after 19,999 and before 20,001.

30,000 is the natural number that comes after 29,999 and before 30,001.

References

  1. ↑ "Sloane's A005900 : Octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24.
  2. ↑ "Sloane's A001845 : Centered octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24.
  3. ↑ "Sloane's A028442 : Numbers n such that Mertens' function is zero". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.