Properties of the Number 61981

Sixty-One Thousand Nine Hundred Eighty-One

Basics

Value: 61980 → 61981 → 61982

Parity: odd

Prime: Yes

Previous Prime: 61979

Next Prime: 61987

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 61981

Divisors: 1, 61981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111001000011101

Octal: 171035

Duodecimal: 2BA51

Hexadecimal: f21d

Square: 3841644361

Square Root: 248.95983611819798

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

Primes that remain prime through 3 iterations of function f(x) = 3x + 8. A23279

Primes that remain prime through 4 iterations of function f(x) = 3x + 8. A23309

a(n) is the smallest prime p such that ∑_{primes q <= p} Kronecker(n,q) > 0, or 0 if no such prime exists. A326615

Primes that remain prime through 5 iterations of function f(x) = 3x + 8. A23337

a(n) = 3ⁿ - 2·n - 1. A61981

Number of permutations of 2 indistinguishable copies of 1..n with exactly 3 adjacent element pairs in decreasing order. A151625