Properties of the Number -21615

Twenty-One Thousand Six Hundred Fifteen

Basics

Value: -21616 → -21615 → -21614

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 11 × 131

Divisors: 1, 3, 5, 11, 15, 33, 55, 131, 165, 393

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101010001101111

Octal: -52157

Duodecimal: -10613

Hexadecimal: -546f

Square: 467208225

Square Root: 147.02040674681865

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

Odd numbers with exactly 4 distinct palindromic prime factors. A46406

a(n) = n * (6·n² + 6·n + 1). A94421

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 49. A31727

A class of Boolean functions of n variables and rank 3. A51361

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001. A260537

Number of permutations f of {1,...,prime(n)-1} with f(prime(n)-1) = prime(n)-1 and f(prime(n)-2) = prime(n)-2 such that 1/(f(1)*f(2)) + 1/(f(2)*f(3)) + ... + 1/(f(prime(n)-2)*f(prime(n)-1)) + 1/(f(prime(n)-1)*f(1)) == 0 (mod prime(n)²). A346387

Expansion of 1/((1-3·x) * (1-7·x))^9/2. A387285

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}. A150310