Properties of the Number 31388

Thirty-One Thousand Three Hundred Eighty-Eight

Basics

Value: 31387 → 31388 → 31389

Parity: even

Prime: No

Previous Prime: 31387

Next Prime: 31391

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 7 × 19 × 59

Divisors: 1, 2, 4, 7, 14, 19, 28, 38, 59, 76

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101010011100

Octal: 75234

Duodecimal: 161B8

Hexadecimal: 7a9c

Square: 985206544

Square Root: 177.1665882721683

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

Triangle read by rows: T(n,f) is the number of rooted maps with n edges and f faces on an orientable surface of genus 0. A269920

Triangle read by rows: T(n,g) is the number of rooted maps with n edges and 6 faces on an orientable surface of genus g. A270410

Triangle read by rows: T(n,g) is the number of rooted maps with n edges and 3 faces on an orientable surface of genus g. A270407

Rounded volume of a regular dodecahedron with edge length n. A71401

Number of genus 0 rooted maps with 3 faces with n vertices. A184

Numbers k such that 2^k + Fibonacci(k) is prime. A74824

Number of genus 0 rooted maps with 6 faces and n vertices. A502

a(n) is the total number of sum of weighted records over set partitions of [n]. A306900

a(n) = prime(7·n-3). A31388