Properties of the Number 25545

Twenty-Five Thousand Five Hundred Forty-Five

Basics

Value: 25544 → 25545 → 25546

Parity: odd

Prime: No

Previous Prime: 25541

Next Prime: 25561

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 13 × 131

Divisors: 1, 3, 5, 13, 15, 39, 65, 131, 195, 393

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 110001111001001

Octal: 61711

Duodecimal: 12949

Hexadecimal: 63c9

Square: 652547025

Square Root: 159.8280325850256

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

Numbers k such that φ(k) = φ(k+1). A1274

The sum of the elements within a jump in a Sieve of Eratosthenes table. A179545

Total number of edges formed after n points have been placed in general position on each edge of a triangle (as in A365929). A366932

Numbers n such that uphi(n) = uphi(n+1), where uphi(n) is the unitary totient function (A047994). A287055

T(n,k) = Number of (n+1) X (k+1) 0..1 arrays with the permanents of 2X2 subblocks nondecreasing rightwards and downwards. A204723

T(n,k) is the number of (n+1) X (k+1) 0..1 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing. A204962

Numbers k such that A206369(k) = A206369(k + 1). A206368

Numbers k such that iphi(k) = iphi(k+1), where iphi(k) is an infinitary analog to the Euler totient function (A091732). A326403

a(n) = ∑_k=1..n k² * floor(n/k)². A350123

Number of (n+1) X 2 0..1 arrays with the permanents of 2 X 2 subblocks nondecreasing rightwards and downwards. A204716