Properties of the Number 725

Seven Hundred Twenty-Five

Basics

Value: 724 → 725 → 726

Parity: odd

Prime: No

Previous Prime: 719

Next Prime: 727

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 5 ² × 29

Divisors: 1, 5, 25, 29, 145, 725

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1011010101

Octal: 1325

Duodecimal: 505

Hexadecimal: 2d5

Square: 525625

Square Root: 26.92582403567252

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

Number of alternating compositions, i.e., compositions with alternating increases and decreases, starting with either an increase or a decrease. A25047

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

a(n) = n² - 4. A28347

Numerator of 1/4 - 1/n². A61037

Number of alternating compositions of n, including twins (x,x). A344604

Number of integer partitions of n not containing their mean. A327472

a(n) = least positive k such that the remainder when 3^k is divided by k is n. A78457

The first Fibonacci based variant of arithmetic derivative: a(p) = A000045(p) for prime p, a(u·v) = a(u)*v + u·a(v), with a(0) = a(1) = 0. A328845

Multiples of 5 whose GCD with 6 is 1. A84967

a(n) = m*(2^e) + ((4^e)-1)/3, where m = 3n+1, and e is the 2-adic valuation of m. A371094