625540131 has 32 divisors (see below), whose sum is σ = 969408000. Its totient is φ = 397910304.

The previous prime is 625540117. The next prime is 625540169. The reversal of 625540131 is 131045526.

625540131 is a `hidden beast` number, since 6 + 255 + 401 + 3 + 1 = 666.

It is not a de Polignac number, because 625540131 - 2⁶ = 625540067 is a prime.

It is a super-2 number, since 2×625540131² = 782600910982994322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 625540095 and 625540104.

It is not an unprimeable number, because it can be changed into a prime (625540031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 315100 + ... + 317078.

It is an arithmetic number, because the mean of its divisors is an integer number (30294000).

Almost surely, 2^625540131 is an apocalyptic number.

625540131 is a deficient number, since it is larger than the sum of its proper divisors (343867869).

625540131 is a wasteful number, since it uses less digits than its factorization.

625540131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520 (or 2514 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 625540131 is about 25010.8002870760. The cubic root of 625540131 is about 855.2341986933.

Adding to 625540131 its reverse (131045526), we get a palindrome (756585657).

The spelling of 625540131 in words is "six hundred twenty-five million, five hundred forty thousand, one hundred thirty-one".