31581196681225 has 9 divisors (see below), whose sum is σ = 39160718726983. Its totient is φ = 25264934866120.

The previous prime is 31581196681211. The next prime is 31581196681283. The reversal of 31581196681225 is 52218669118513.

The square root of 31581196681225 is 5619715.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11369230805241 + 20211965875984 = 3371829^2 + 4495772^2 .

It is not a de Polignac number, because 31581196681225 - 2¹¹ = 31581196679177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31581196681225.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27536604 + ... + 28660546.

Almost surely, 2^{31581196681225} is an apocalyptic number.

31581196681225 is the 5619715-th square number.

31581196681225 is the 2809858-th centered octagonal number.

It is an amenable number.

31581196681225 is a deficient number, since it is larger than the sum of its proper divisors (7579522045758).

31581196681225 is an frugal number, since it uses more digits than its factorization.

31581196681225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247896 (or 1123948 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 58.

The spelling of 31581196681225 in words is "thirty-one trillion, five hundred eighty-one billion, one hundred ninety-six million, six hundred eighty-one thousand, two hundred twenty-five".