31381331125 has 16 divisors (see below), whose sum is σ = 39173050800. Its totient is φ = 25099200000.

The previous prime is 31381331119. The next prime is 31381331147. The reversal of 31381331125 is 52113318313.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5601175281 + 25780155844 = 74841^2 + 160562^2 .

It is not a de Polignac number, because 31381331125 - 2⁹ = 31381330613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554125 + ... + 608125.

It is an arithmetic number, because the mean of its divisors is an integer number (2448315675).

Almost surely, 2^31381331125 is an apocalyptic number.

It is an amenable number.

31381331125 is a deficient number, since it is larger than the sum of its proper divisors (7791719675).

31381331125 is an equidigital number, since it uses as much as digits as its factorization.

31381331125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58665 (or 58655 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

Adding to 31381331125 its reverse (52113318313), we get a palindrome (83494649438).

The spelling of 31381331125 in words is "thirty-one billion, three hundred eighty-one million, three hundred thirty-one thousand, one hundred twenty-five".