625557531 has 4 divisors (see below), whose sum is σ = 834076712. Its totient is φ = 417038352.

The previous prime is 625557523. The next prime is 625557533. The reversal of 625557531 is 135755526.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 625557531 - 2³ = 625557523 is a prime.

It is a super-2 number, since 2×625557531² = 782644449181631922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 625557531.

It is not an unprimeable number, because it can be changed into a prime (625557533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104259586 + ... + 104259591.

It is an arithmetic number, because the mean of its divisors is an integer number (208519178).

Almost surely, 2^625557531 is an apocalyptic number.

625557531 is a deficient number, since it is larger than the sum of its proper divisors (208519181).

625557531 is a wasteful number, since it uses less digits than its factorization.

625557531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208519180.

The product of its digits is 157500, while the sum is 39.

The square root of 625557531 is about 25011.1481343820. The cubic root of 625557531 is about 855.2421283402.

The spelling of 625557531 in words is "six hundred twenty-five million, five hundred fifty-seven thousand, five hundred thirty-one".