Properties of the Number 15661

Fifteen Thousand Six Hundred Sixty-One

Basics

Value: 15660 → 15661 → 15662

Parity: odd

Prime: Yes

Previous Prime: 15649

Next Prime: 15667

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 15661

Divisors: 1, 15661

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110100101101

Octal: 36455

Duodecimal: 9091

Hexadecimal: 3d2d

Square: 245266921

Square Root: 125.14391715141412

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 of the form 2·n²+6·n+1. A176549

Primes having only {1, 5, 6} as digits. A385779

The 240-degree spoke (or ray) of a hexagonal spiral of Ulam. A244805

Primes that are the sum of two squares and which set a record for the gap to the next prime of that form. A84161

Centered 36-gonal numbers. A195316

Expansion of ∏_k>=1 (1 - k²*x^k). A292164

First occurrence prime gaps of the primes in sequence A002313 (Real primes with corresponding complex primes). a(0) = 2 with length of gap 3. For n>0 the size of the gap in the sequence is 4n, a(n) is the starting prime of the gap. A84160

Expansion of x/(1 - 4·x + 3·x² - 2·x³). A175005

Parameters n for which the elliptic curve y²=x³+n has rank 4. A179124

Lesser of consecutive primes whose sum is of the form k*(k+2), for some integer k. A242384