31145125525225 has 12 divisors (see below), whose sum is σ = 38672643198796. Its totient is φ = 24882108454080.

The previous prime is 31145125525159. The next prime is 31145125525231. The reversal of 31145125525225 is 52252552154113.

It can be written as a sum of positive squares in 6 ways, for example, as 2460189113001 + 28684936412224 = 1568499^2 + 5355832^2 .

It is not a de Polignac number, because 31145125525225 - 2¹¹ = 31145125523177 is a prime.

It is a super-2 number, since 2×31145125525225² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

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, 849780462 + ... + 849817111.

Almost surely, 2^{31145125525225} is an apocalyptic number.

It is an amenable number.

31145125525225 is a deficient number, since it is larger than the sum of its proper divisors (7527517673571).

31145125525225 is a wasteful number, since it uses less digits than its factorization.

31145125525225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699598316 (or 1699598311 counting only the distinct ones).

The product of its digits is 600000, while the sum is 43.

Adding to 31145125525225 its reverse (52252552154113), we get a palindrome (83397677679338).

The spelling of 31145125525225 in words is "thirty-one trillion, one hundred forty-five billion, one hundred twenty-five million, five hundred twenty-five thousand, two hundred twenty-five".