Properties of the Number 31900

Thirty-One Thousand Nine Hundred

Basics

Value: 31899 → 31900 → 31901

Parity: even

Prime: No

Previous Prime: 31891

Next Prime: 31907

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5 ² × 11 × 29

Divisors: 1, 2, 4, 5, 10, 11, 20, 22, 25, 29

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111110010011100

Octal: 76234

Duodecimal: 16564

Hexadecimal: 7c9c

Square: 1017610000

Square Root: 178.60571099491753

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 regions in regular n-gon with all diagonals drawn. A7678

4-dimensional analog of centered polygonal numbers. Also number of regions created by sides and diagonals of a convex n-gon in general position. A6522

Numbers n such that sopf(σ(n)) = σ(sopf(n)), where sopf(x) = sum of the distinct prime factors of x. A76532

a(n) = n*(n-3)*(n²-7·n+14)/8. A176145

Number of partitions of n such that (number parts having multiplicity 1) is a part or (number of parts > 1) is a part. A241515

Square array T(n, k) = v(k, n)((1)), where v(n, q) = M·v(n-1, q), M = {{0, 1, 0}, {0, 0, 1}, {8·q³, 6·q, 0}}, with v(0, q) = {1, 1, 1}, read by antidiagonals. A173747

Aliquot sequence starting at 660. A14362

Starting positions of strings of four 9's in the decimal expansion of π. A83643

a(n) = A007678(2·n+1). A341735

a(n) = (5ⁿ - 4ⁿ + 3ⁿ - 2ⁿ)/2. A83327