Properties of the Number 1525

One Thousand Five Hundred Twenty-Five

Basics

Value: 1524 → 1525 → 1526

Parity: odd

Prime: No

Previous Prime: 1523

Next Prime: 1531

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

Today's Target

2730 Try Today's Challenge

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

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

a(n) = 4*(n+1)*n + 5. A78370

Coordination sequence for "cab" 3D uniform tiling formed from octahedra and truncated cubes. A299266

a(n) = n² + 4. A87475

Numbers m such that the Bernoulli number B_2·m has denominator 66. A51229

a(n) = floor(5ⁿ/2ⁿ). A94969