31556225 has 12 divisors (see below), whose sum is σ = 39209916. Its totient is φ = 25193280.

The previous prime is 31556201. The next prime is 31556243. The reversal of 31556225 is 52265513.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1129969 + 30426256 = 1063^2 + 5516^2 .

It is not a de Polignac number, because 31556225 - 2⁸ = 31555969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15359 + ... + 17291.

It is an arithmetic number, because the mean of its divisors is an integer number (3267493).

Almost surely, 2^31556225 is an apocalyptic number.

It is an amenable number.

31556225 is a deficient number, since it is larger than the sum of its proper divisors (7653691).

31556225 is a wasteful number, since it uses less digits than its factorization.

31556225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596 (or 2591 counting only the distinct ones).

The product of its digits is 9000, while the sum is 29.

The square root of 31556225 is about 5617.4927681306. The cubic root of 31556225 is about 316.0057715391.

The spelling of 31556225 in words is "thirty-one million, five hundred fifty-six thousand, two hundred twenty-five".