31915479225 has 24 divisors (see below), whose sum is σ = 60305058880. Its totient is φ = 14589933120.

The previous prime is 31915479191. The next prime is 31915479251. The reversal of 31915479225 is 52297451913.

It is not a de Polignac number, because 31915479225 - 2¹⁵ = 31915446457 is a prime.

It is a super-2 number, since 2×31915479225² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30395170 + ... + 30396219.

Almost surely, 2^31915479225 is an apocalyptic number.

31915479225 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31915479225 is a deficient number, since it is larger than the sum of its proper divisors (28389579655).

31915479225 is a wasteful number, since it uses less digits than its factorization.

31915479225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60791409 (or 60791404 counting only the distinct ones).

The product of its digits is 680400, while the sum is 48.

The spelling of 31915479225 in words is "thirty-one billion, nine hundred fifteen million, four hundred seventy-nine thousand, two hundred twenty-five".