31565312225 has 12 divisors (see below), whose sum is σ = 39224815344. Its totient is φ = 25198167120.

The previous prime is 31565312209. The next prime is 31565312231. The reversal of 31565312225 is 52221356513.

It is not a de Polignac number, because 31565312225 - 2⁴ = 31565312209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1340159 + ... + 1363508.

It is an arithmetic number, because the mean of its divisors is an integer number (3268734612).

Almost surely, 2^31565312225 is an apocalyptic number.

It is an amenable number.

31565312225 is a deficient number, since it is larger than the sum of its proper divisors (7659503119).

31565312225 is a wasteful number, since it uses less digits than its factorization.

31565312225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704144 (or 2704139 counting only the distinct ones).

The product of its digits is 54000, while the sum is 35.

Adding to 31565312225 its reverse (52221356513), we get a palindrome (83786668738).

The spelling of 31565312225 in words is "thirty-one billion, five hundred sixty-five million, three hundred twelve thousand, two hundred twenty-five".