31121242025 has 6 divisors (see below), whose sum is σ = 38590340142. Its totient is φ = 24896993600.

The previous prime is 31121242021. The next prime is 31121242037. The reversal of 31121242025 is 52024212113.

It can be written as a sum of positive squares in 3 ways, for example, as 7369192336 + 23752049689 = 85844^2 + 154117^2 .

It is not a de Polignac number, because 31121242025 - 2² = 31121242021 is a prime.

It is a super-2 number, since 2×31121242025² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121242021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622424816 + ... + 622424865.

It is an arithmetic number, because the mean of its divisors is an integer number (6431723357).

Almost surely, 2^31121242025 is an apocalyptic number.

It is an amenable number.

31121242025 is a deficient number, since it is larger than the sum of its proper divisors (7469098117).

31121242025 is a wasteful number, since it uses less digits than its factorization.

31121242025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244849691 (or 1244849686 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 31121242025 its reverse (52024212113), we get a palindrome (83145454138).

The spelling of 31121242025 in words is "thirty-one billion, one hundred twenty-one million, two hundred forty-two thousand, twenty-five".