Properties of the Number 30981

Thirty Thousand Nine Hundred Eighty-One

Basics

Value: 30980 → 30981 → 30982

Parity: odd

Prime: No

Previous Prime: 30977

Next Prime: 30983

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 23 × 449

Divisors: 1, 3, 23, 69, 449, 1347, 10327, 30981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100100000101

Octal: 74405

Duodecimal: 15B19

Hexadecimal: 7905

Square: 959822361

Square Root: 176.0142039722931

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 partitions of n into relatively prime parts such that multiplicities of parts are also relatively prime. A100953

Numbers k such that k·6^k + 1 is prime. A242176

Numbers that are the sum of seven fourth powers in exactly seven ways. A345829

Products of 3 evil primes (A027699) p,q,r, such that numbers p·q, p·r, q·r, and p·q*r are odious (A000069). A230353

Number of 0..n arrays of length 6 with each element differing from at least one neighbor by 1 or less, starting with 0. A221685

Number of separable partitions of n in which the number of distinct (repeatable) parts is 6. A325650

Lucky numbers. A959

Number of noncrossing bushes with n nodes; i.e., rooted noncrossing trees with n nodes and no nonroot nodes of degree 1. A30981

Expansion of e.g.f. (1 + x * (exp(x) - 1))³. A377680