31225121325 has 90 divisors (see below), whose sum is σ = 59291314302. Its totient is φ = 16245446400.

The previous prime is 31225121293. The next prime is 31225121371. The reversal of 31225121325 is 52312152213.

31225121325 is a `hidden beast` number, since 3 + 12 + 2 + 512 + 132 + 5 = 666.

It can be written as a sum of positive squares in 9 ways, for example, as 30425476041 + 799645284 = 174429^2 + 28278^2 .

It is not a de Polignac number, because 31225121325 - 2⁵ = 31225121293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 3399439 + ... + 3408611.

Almost surely, 2^31225121325 is an apocalyptic number.

It is an amenable number.

31225121325 is a deficient number, since it is larger than the sum of its proper divisors (28066192977).

31225121325 is an equidigital number, since it uses as much as digits as its factorization.

31225121325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277 (or 9222 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

Adding to 31225121325 its reverse (52312152213), we get a palindrome (83537273538).

The spelling of 31225121325 in words is "thirty-one billion, two hundred twenty-five million, one hundred twenty-one thousand, three hundred twenty-five".