3131320121 has 4 divisors (see below), whose sum is σ = 3133497600. Its totient is φ = 3129142644.

The previous prime is 3131320111. The next prime is 3131320133. The reversal of 3131320121 is 1210231313.

3131320121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3131320121 - 2²² = 3127125817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3131320121.

It is not an unprimeable number, because it can be changed into a prime (3131320111) 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, 1086581 + ... + 1089458.

It is an arithmetic number, because the mean of its divisors is an integer number (783374400).

Almost surely, 2^3131320121 is an apocalyptic number.

It is an amenable number.

3131320121 is a deficient number, since it is larger than the sum of its proper divisors (2177479).

3131320121 is a wasteful number, since it uses less digits than its factorization.

3131320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177478.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 3131320121 is about 55958.1997655393. The cubic root of 3131320121 is about 1462.9938131902.

Adding to 3131320121 its reverse (1210231313), we get a palindrome (4341551434).

The spelling of 3131320121 in words is "three billion, one hundred thirty-one million, three hundred twenty thousand, one hundred twenty-one".