Properties of the Number 31221

Thirty-One Thousand Two Hundred Twenty-One

Basics

Value: 31220 → 31221 → 31222

Parity: odd

Prime: No

Previous Prime: 31219

Next Prime: 31223

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 3469

Divisors: 1, 3, 9, 3469, 10407, 31221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100111110101

Octal: 74765

Duodecimal: 16099

Hexadecimal: 79f5

Square: 974750841

Square Root: 176.69465187152667

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

Numbers that are the sum of 3 positive cubes in 3 or more ways. A25398

Numbers that are the sum of 3 positive cubes in exactly 3 ways. A25397

Numbers that are the sum of 3 distinct positive cubes in 3 or more ways. A25402

Unique representation of nonnegative numbers by iterated tribonacci A, B and C sequences. A316713

Numbers that are the sum of 3 distinct positive cubes in exactly 3 ways. A25401

n-th term in Recamán's sequence A005132 is divisible by n. A64568

Values of k such that A005132(k) (the k-th number in the Recamán sequence) divides k. A330791

Fixed points in the Recamán sequence; k such that A005132(k) = k. A331659

Sum of all (j+1)-th products of (n-2j) successive primes for j=0..floor(n/2). A350758

Numbers that can be expressed as the sum of three nonnegative cubes in three ways. A219329