31321500225 has 24 divisors (see below), whose sum is σ = 53455364352. Its totient is φ = 16165934400.

The previous prime is 31321500167. The next prime is 31321500233. The reversal of 31321500225 is 52200512313.

It is a happy number.

It is not a de Polignac number, because 31321500225 - 2⁸ = 31321499969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31321500195 and 31321500204.

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, 6733482 + ... + 6738131.

It is an arithmetic number, because the mean of its divisors is an integer number (2227306848).

Almost surely, 2^31321500225 is an apocalyptic number.

It is an amenable number.

31321500225 is a deficient number, since it is larger than the sum of its proper divisors (22133864127).

31321500225 is a wasteful number, since it uses less digits than its factorization.

31321500225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13471657 (or 13471652 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 31321500225 in words is "thirty-one billion, three hundred twenty-one million, five hundred thousand, two hundred twenty-five".