31112121125 has 16 divisors (see below), whose sum is σ = 38971246080. Its totient is φ = 24797826000.

The previous prime is 31112121113. The next prime is 31112121151. The reversal of 31112121125 is 52112121113.

It is not a de Polignac number, because 31112121125 - 2¹⁰ = 31112120101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31112121097 and 31112121106.

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, 425345 + ... + 493094.

It is an arithmetic number, because the mean of its divisors is an integer number (2435702880).

Almost surely, 2^31112121125 is an apocalyptic number.

It is an amenable number.

31112121125 is a deficient number, since it is larger than the sum of its proper divisors (7859124955).

31112121125 is an equidigital number, since it uses as much as digits as its factorization.

31112121125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918725 (or 918715 counting only the distinct ones).

The product of its digits is 120, while the sum is 20.

Adding to 31112121125 its reverse (52112121113), we get a palindrome (83224242238).

The spelling of 31112121125 in words is "thirty-one billion, one hundred twelve million, one hundred twenty-one thousand, one hundred twenty-five".