Properties of the Number -1525

Five Hundred Twenty-Five

Basics

Value: -1526 → -1525 → -1524

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 ² × 61

Divisors: 1, 5, 25, 61, 305, 1525

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: -10111110101

Octal: -2765

Duodecimal: -A71

Hexadecimal: -5f5

Square: 2325625

Square Root: 39.05124837953327

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

a(n) = n! * [xⁿ] exp(-n·x)/(1 + LambertW(-x)). A290158

G.f.: 1/(1-2·x+2·x²-x³+x⁴). A199802

Numerators of coefficients in a series for the inverse of harmonic number H(x). A118050

Trisection 2 of A199802. A199929

Values z of primitive solutions (x, y, z) to the Diophantine equation 2·x³ + 2·y³ + z³ = 1. A338239

Heptagonal numbers (or 7-gonal numbers): n*(5·n-3)/2. A566

Odd numbers of the form p^1+4k * r², where p is prime of the form 1+4m, r > 1, and gcd(p,r) = 1. (Euler's criteria for odd perfect numbers). A228058

Generalized heptagonal numbers: m*(5·m - 3)/2, m = 0, +-1, +-2 +-3, ... A85787

Replace n with concatenation of its divisors. A37278

List of codewords in binary lexicode with Hamming distance 4 written as decimal numbers. A75928