225131131521 has 6 divisors (see below), whose sum is σ = 325189412210. Its totient is φ = 150087421008.

The previous prime is 225131131517. The next prime is 225131131553. The reversal of 225131131521 is 125131131522.

225131131521 is a `hidden beast` number, since 2 + 2 + 5 + 1 + 3 + 1 + 131 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 217935850896 + 7195280625 = 466836^2 + 84825^2 .

It is not a de Polignac number, because 225131131521 - 2² = 225131131517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225131111521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12507285076 + ... + 12507285093.

Almost surely, 2^225131131521 is an apocalyptic number.

It is an amenable number.

225131131521 is a deficient number, since it is larger than the sum of its proper divisors (100058280689).

225131131521 is a wasteful number, since it uses less digits than its factorization.

225131131521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25014570175 (or 25014570172 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

Subtracting from 225131131521 its reverse (125131131522), we obtain a palindrome (99999999999).

The spelling of 225131131521 in words is "two hundred twenty-five billion, one hundred thirty-one million, one hundred thirty-one thousand, five hundred twenty-one".