325 (number)

← 324 325 326 →
List of numbers ; Integers ; ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	three hundred twenty five
Ordinal	325th (three hundred twenty-fifth)
Factorization	52 × 131
Divisors	1, 5, 13, 25, 65, 325
Greek numeral	ΤΚΕ´
Roman numeral	CCCXXV
Binary	1010001012
Ternary	1100013
Senary	13016
Octal	5058
Duodecimal	23112
Hexadecimal	14516

Last updated January 12, 2026

325 (three hundred [and] twenty-five) is the natural number following 324 and preceding 326.

In mathematics

325 is the smallest number to be the sum of two squares in 3 different ways: 1² + 18², 6² + 17² and 10² + 15².
325 is the smallest (and only known) 3-hyperperfect number.^[1]^[2]
325 is the smallest odd unprimeable number.

References

↑ Sloane, N. J. A. (ed.). "SequenceA034897(Hyperperfect numbers: x such that x = 1 + k*(sigma(x)-x-1) for some k > 0)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
↑ Sloane, N. J. A. (ed.). "SequenceA007594(Smallest n-hyperperfect number: m such that m=n(sigma(m)-m-1)+1; or 0 if no such number exists)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

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[1] Sloane, N. J. A. (ed.). "SequenceA034897(Hyperperfect numbers: x such that x = 1 + k*(sigma(x)-x-1) for some k > 0)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

[2] Sloane, N. J. A. (ed.). "SequenceA007594(Smallest n-hyperperfect number: m such that m=n(sigma(m)-m-1)+1; or 0 if no such number exists)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

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