Properties of the Number 31856

Thirty-One Thousand Eight Hundred Fifty-Six

Basics

Value: 31855 → 31856 → 31857

Parity: even

Prime: No

Previous Prime: 31849

Next Prime: 31859

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ⁴ × 11 × 181

Divisors: 1, 2, 4, 8, 11, 16, 22, 44, 88, 176

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111110001110000

Octal: 76160

Duodecimal: 16528

Hexadecimal: 7c70

Square: 1014804736

Square Root: 178.48249213858483

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 isomorphism classes of connected 3-regular (trivalent, cubic) loopless multigraphs of order 2n. A421

Triangle T(n,d) read by rows: the number of mixed trees with n>=1 nodes and 0<=d<n arcs. A335362

Dirichlet g.f.: ∏_k>=2 1 / (1 - k^-s)^binomial(k+2,3). A344203

a(n) = ceiling((n + 7/10)³). A34133

Number of planar Langford sequences. A125762

Number of line segments connecting exactly 4 points in an n·n grid of points. A177720

Expansion of e.g.f. z*(2*(exp(z) + 1)/(cosh(z) + cos(z)) - 1). A281588

Number of distinct products i·j*k·l*m for 1 <= i <= j <= k <= l <= m <= n. A284988

Number of set partitions of [n] with distinct block sizes and one of the block sizes is 1. A327876

a(n) = (7·n+1)*(7·n+6). A1526