31520045225 has 6 divisors (see below), whose sum is σ = 39084856110. Its totient is φ = 25216036160.

The previous prime is 31520045209. The next prime is 31520045257. The reversal of 31520045225 is 52254002513.

It can be written as a sum of positive squares in 3 ways, for example, as 6453872896 + 25066172329 = 80336^2 + 158323^2 .

It is not a de Polignac number, because 31520045225 - 2⁴ = 31520045209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 630400880 + ... + 630400929.

It is an arithmetic number, because the mean of its divisors is an integer number (6514142685).

Almost surely, 2^31520045225 is an apocalyptic number.

It is an amenable number.

31520045225 is a deficient number, since it is larger than the sum of its proper divisors (7564810885).

31520045225 is a wasteful number, since it uses less digits than its factorization.

31520045225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260801819 (or 1260801814 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 31520045225 its reverse (52254002513), we get a palindrome (83774047738).

The spelling of 31520045225 in words is "thirty-one billion, five hundred twenty million, forty-five thousand, two hundred twenty-five".