Properties of the Number 2521

Two Thousand Five Hundred Twenty-One

Basics

Value: 2520 → 2521 → 2522

Parity: odd

Prime: Yes

Previous Prime: 2503

Next Prime: 2531

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2521

Divisors: 1, 2521

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100111011001

Octal: 4731

Duodecimal: 1561

Hexadecimal: 9d9

Square: 6355441

Square Root: 50.20956084253277

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

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

Expansion of ∏_m>=1 (1 + q^m)^m; number of partitions of n into distinct parts, where n different parts of size n are available. A26007

Centered 12-gonal numbers, or centered dodecagonal numbers: numbers of the form 6·k*(k-1) + 1. A3154

Primes whose base-3 representation also is the base-2 representation of a prime. A235265

Numbers k such that 3^k - 2 is prime. A14224

Numbers obtained by reinterpreting base-2 representation of n in primorial base: a(0) = 0, a(2n) = A276154(a(n)), a(2n+1) = 1 + A276154(a(n)). A276156

Partial sums of A299289. A299290

Numbers k such that k² is centered hexagonal. A1570

Primes of the form j² + (j+1)². A27862

Concentric hexagonal numbers: floor(3·n²/2). A32528