625531 has 4 divisors (see below), whose sum is σ = 652752. Its totient is φ = 598312.

The previous prime is 625529. The next prime is 625543. The reversal of 625531 is 135526.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135526 = 2 ⋅67763.

It is a cyclic number.

It is not a de Polignac number, because 625531 - 2¹ = 625529 is a prime.

It is a super-2 number, since 2×625531² = 782578063922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (625591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13576 + ... + 13621.

It is an arithmetic number, because the mean of its divisors is an integer number (163188).

2⁶²⁵⁵³¹ is an apocalyptic number.

625531 is a deficient number, since it is larger than the sum of its proper divisors (27221).

625531 is a wasteful number, since it uses less digits than its factorization.

625531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27220.

The product of its digits is 900, while the sum is 22.

The square root of 625531 is about 790.9051776288. The cubic root of 625531 is about 85.5230037393.

It can be divided in two parts, 625 and 531, that added together give a square (1156 = 34²).

The spelling of 625531 in words is "six hundred twenty-five thousand, five hundred thirty-one".