31225225 has 12 divisors (see below), whose sum is σ = 39766924. Its totient is φ = 24304320.

The previous prime is 31225213. The next prime is 31225247. The reversal of 31225225 is 52252213.

It can be written as a sum of positive squares in 6 ways, for example, as 710649 + 30514576 = 843^2 + 5524^2 .

It is not a de Polignac number, because 31225225 - 2⁷ = 31225097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31225196 and 31225205.

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, 15954 + ... + 17803.

Almost surely, 2^31225225 is an apocalyptic number.

It is an amenable number.

31225225 is a deficient number, since it is larger than the sum of its proper divisors (8541699).

31225225 is a wasteful number, since it uses less digits than its factorization.

31225225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33804 (or 33799 counting only the distinct ones).

The product of its digits is 1200, while the sum is 22.

The square root of 31225225 is about 5587.9535610096. The cubic root of 31225225 is about 314.8970016828.

Adding to 31225225 its reverse (52252213), we get a palindrome (83477438).

The spelling of 31225225 in words is "thirty-one million, two hundred twenty-five thousand, two hundred twenty-five".