50 (number)

← 49 50 51 →
← 50 51 52 53 54 55 56 57 58 59 → List of numbers ; Integers ; ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	fifty
Ordinal	50th; (fiftieth)
Numeral system	quinquagesimal
Factorization	2 × 52
Divisors	1, 2, 5, 10, 25, 50
Greek numeral	Ν´
Roman numeral	L, l
Unicode symbol	ↆ
Binary	1100102
Ternary	12123
Senary	1226
Octal	628
Duodecimal	4212
Hexadecimal	3216
Armenian	Ծ
Hebrew	נ / ן
Babylonian numeral	𒐐
Egyptian hieroglyph	𓎊

Last updated December 02, 2025

50 (fifty) is the natural number following 49 and preceding 51.

In mathematics

50 as the sum of two non-zero squares Square-sum-50.png — 50 as the sum of two non-zero squares

Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways.^[1] 50 is an unsigned Stirling number of the first kind ^[2] and a Narayana number.^[3]

In science

The fifth magic number in nuclear physics, corresponding to the element tin ^[4]

In religion

In Hindu tantric tradition, the number 50 holds significance as the 50 Rudras in the Malinīvijayottara correlate with the 50 phonemes of Sanskrit, as well as with the 50 severed heads worn around goddess Kali's head. The mantra Aham ("I am"), as laid out in the Vijñāna Bhairava represents the first अ(a) and last ह(ha) phonemes of the Sanskrit alphabet and is believed to represent ultimate reality, in accordance with its non-dual philosophy.^{[ relevant? ]}

In other fields

The percentage (50%) equivalent to one half, so that the phrase "fifty-fifty" commonly expresses something divided equally in two; in business this is often denoted as being the ultimate in equal partnership
In years of marriage, the gold or "golden" wedding anniversary

References

↑ de Koninck, J.M. (2009). Those fascinating numbers. AMS Bookstore. p. 18. ISBN 0-8218-4807-0.
↑ Sloane, N. J. A. (ed.). "SequenceA000254(Unsigned Stirling numbers of first kind, s(n+1,2): a(n+1) = (n+1)*a(n) + n!.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
↑ Sloane, N. J. A. (ed.). "SequenceA001263(Triangle of Narayana numbers T(n,k) = C(n-1,k-1)*C(n,k-1)/k with 1 <= k <= n, read by rows. Also called the Catalan triangle.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
↑ "Magic number". Encyclopedia Britannica. Archived from the original on 10 August 2023. Retrieved 22 November 2025.

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[1] Koninck, J.M. (2009). Those fascinating numbers. AMS Bookstore. p. 18. ISBN 0-8218-4807-0.

[2] Sloane, N. J. A. (ed.). "SequenceA000254(Unsigned Stirling numbers of first kind, s(n+1,2): a(n+1) = (n+1)*a(n) + n!.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

[3] Sloane, N. J. A. (ed.). "SequenceA001263(Triangle of Narayana numbers T(n,k) = C(n-1,k-1)*C(n,k-1)/k with 1 <= k <= n, read by rows. Also called the Catalan triangle.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

[4] "Magic number". Encyclopedia Britannica. Archived from the original on 10 August 2023. Retrieved 22 November 2025.

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