Properties of the Number 31021

Thirty-One Thousand Twenty-One

Basics

Value: 31020 → 31021 → 31022

Parity: odd

Prime: No

Previous Prime: 31019

Next Prime: 31033

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 67 × 463

Divisors: 1, 67, 463, 31021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100100101101

Octal: 74455

Duodecimal: 15B51

Hexadecimal: 792d

Square: 962302441

Square Root: 176.12779451296151

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

a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 0, 1, 1, 0. A25250

Variant of Lucas numbers: a(n) = a(n-1) + 4·a(n-2) starting with a(0)=2 and a(1)=1. A72265

Numerators of partial sums of a certain alternating series of inverse central binomial coefficients. A145557

Euler pseudoprimes to base 6: composite integers such that abs(6^{(n - 1}/2)) == 1 mod n. A262053

Nonprime numbers k such that k divides 3^(k+1/2) - 2^(k+1/2) - 1. A130062

The least number s having exactly n fours in the continued fraction of sqrt(s). A206584

A partial product representation of A006131 and A072265. A72270

Squares written in base 4. A1739

Pseudoprimes to base 15. A20143

Pseudoprimes to base 90. A20218