Properties of the Number 51991

Fifty-One Thousand Nine Hundred Ninety-One

Basics

Value: 51990 → 51991 → 51992

Parity: odd

Prime: Yes

Previous Prime: 51977

Next Prime: 52009

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 51991

Divisors: 1, 51991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100101100010111

Octal: 145427

Duodecimal: 26107

Hexadecimal: cb17

Square: 2703064081

Square Root: 228.01535036045271

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 n such that 4ⁿ+3^n-1 is prime. A93717

Consecutive states of the linear congruential pseudo-random number generator for the Texas Instruments TI99 when started at 1. A384221

Primes p such that, if q is the next prime, p² + q is a prime times a power of 10. A352852

Primes of the form 9n² + 7. A201707

Discriminants of real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r²*k²+2k, k odd. A51991

Least prime p such that p + nextprime(p) is a multiple of n. A254862