31505442225 has 24 divisors (see below), whose sum is σ = 52095743040. Its totient is φ = 16800726720.

The previous prime is 31505442217. The next prime is 31505442239. The reversal of 31505442225 is 52224450513.

It is a happy number.

It is not a de Polignac number, because 31505442225 - 2³ = 31505442217 is a prime.

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, 676387 + ... + 721463.

It is an arithmetic number, because the mean of its divisors is an integer number (2170655960).

Almost surely, 2^31505442225 is an apocalyptic number.

It is an amenable number.

31505442225 is a deficient number, since it is larger than the sum of its proper divisors (20590300815).

31505442225 is a wasteful number, since it uses less digits than its factorization.

31505442225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54409 (or 54404 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 31505442225 its reverse (52224450513), we get a palindrome (83729892738).

The spelling of 31505442225 in words is "thirty-one billion, five hundred five million, four hundred forty-two thousand, two hundred twenty-five".