31112820479 has 4 divisors (see below), whose sum is σ = 33506114376. Its totient is φ = 28719526584.

The previous prime is 31112820413. The next prime is 31112820547. The reversal of 31112820479 is 97402821113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97402821113 = 13 ⋅7492524701.

It is a cyclic number.

It is not a de Polignac number, because 31112820479 - 2⁸ = 31112820223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112822479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1196646929 + ... + 1196646954.

It is an arithmetic number, because the mean of its divisors is an integer number (8376528594).

Almost surely, 2^31112820479 is an apocalyptic number.

31112820479 is a deficient number, since it is larger than the sum of its proper divisors (2393293897).

31112820479 is a wasteful number, since it uses less digits than its factorization.

31112820479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393293896.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 31112820479 in words is "thirty-one billion, one hundred twelve million, eight hundred twenty thousand, four hundred seventy-nine".