Properties of the Number 15991

Fifteen Thousand Nine Hundred Ninety-One

Basics

Value: 15990 → 15991 → 15992

Parity: odd

Prime: Yes

Previous Prime: 15973

Next Prime: 16001

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 15991

Divisors: 1, 15991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11111001110111

Octal: 37167

Duodecimal: 9307

Hexadecimal: 3e77

Square: 255712081

Square Root: 126.45552577882866

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 integer partitions of n with integer mean and integer median. A359906

Primes having only {1, 5, 9} as digits. A385781

Prime p1 of consecutive primes p1, p2, where p2-p1=10, and p1, p2 are in different centuries. A160500

Primes p such that 10p+1 divides 2^p-1. A188133

Primes of the form 3n² + 4. A201477

Smallest of five consecutive primes whose sum is a square. A206281

Number of (w,x,y) with all terms in {0,...,n} and |w-x| + |x-y| > w+x+y. A213482

Primes congruent to 2 mod 59. A142729

a(1) = 2; a(n + 1) = smallest prime > a(n) such that a(n + 1) - a(n) is the product of 7 primes. A285692

Number of odd-length multiset partitions of integer partitions of n. A358837