Properties of the Number 31139

Thirty-One Thousand One Hundred Thirty-Nine

Basics

Value: 31138 → 31139 → 31140

Parity: odd

Prime: Yes

Previous Prime: 31123

Next Prime: 31147

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 31139

Divisors: 1, 31139

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100110100011

Octal: 74643

Duodecimal: 1602B

Hexadecimal: 79a3

Square: 969637321

Square Root: 176.46246059714798

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of subsets of {1..n} whose mean is an integer, where {} has mean 0. A327475

Number of semi-sums of strict integer partitions of n. A366741

a(1) = 2; a(n) is the smallest prime greater than the sum of all previous terms. A70218

Primes p such that exactly four numbers among all circular permutations of the digits of p are prime. A344628

Primes p such that p's set of distinct digits is {1,3,9}. A108383

Emirps whose internal digits are also an emirp. A225235

Number of ways to place 3 nonattacking nightriders on a 3 X n board. A172218

The number of n-digit numbers in A264847 (pluritriangular numbers). A265108

The smallest k >= 0 that can be represented as a linear combination of 1², 2², ..., n² with coefficients +-1 and that cannot be represented using 1², 2², ..., m² with 1<=m<n. A392127

Prime sequence overlaying the central digits of prime numbers. If possible, the value is greater than the previous one. Zero if no such embedding is possible. A133781