31986225 has 24 divisors (see below), whose sum is σ = 58761120. Its totient is φ = 17058960.

The previous prime is 31986221. The next prime is 31986239. The reversal of 31986225 is 52268913.

It is not a de Polignac number, because 31986225 - 2² = 31986221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31986225.

It is not an unprimeable number, because it can be changed into a prime (31986221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23019 + ... + 24368.

It is an arithmetic number, because the mean of its divisors is an integer number (2448380).

Almost surely, 2^31986225 is an apocalyptic number.

It is an amenable number.

31986225 is a deficient number, since it is larger than the sum of its proper divisors (26774895).

31986225 is a wasteful number, since it uses less digits than its factorization.

31986225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47406 (or 47395 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 31986225 is about 5655.6365689461. The cubic root of 31986225 is about 317.4346487523.

The spelling of 31986225 in words is "thirty-one million, nine hundred eighty-six thousand, two hundred twenty-five".