625131945 has 16 divisors (see below), whose sum is σ = 1111345920. Its totient is φ = 333403632.

The previous prime is 625131943. The next prime is 625131971. The reversal of 625131945 is 549131526.

625131945 is a `hidden beast` number, since 625 + 13 + 19 + 4 + 5 = 666.

It is not a de Polignac number, because 625131945 - 2¹ = 625131943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (625131943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2315169 + ... + 2315438.

It is an arithmetic number, because the mean of its divisors is an integer number (69459120).

Almost surely, 2^625131945 is an apocalyptic number.

It is an amenable number.

625131945 is a deficient number, since it is larger than the sum of its proper divisors (486213975).

625131945 is a wasteful number, since it uses less digits than its factorization.

625131945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630621 (or 4630615 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 625131945 is about 25002.6387607388. The cubic root of 625131945 is about 855.0481351786.

The spelling of 625131945 in words is "six hundred twenty-five million, one hundred thirty-one thousand, nine hundred forty-five".