3131201121 has 16 divisors (see below), whose sum is σ = 4416768000. Its totient is φ = 1967655888.

The previous prime is 3131201089. The next prime is 3131201167. The reversal of 3131201121 is 1211021313.

It is a happy number.

It is not a de Polignac number, because 3131201121 - 2⁵ = 3131201089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3131201121.

It is not an unprimeable number, because it can be changed into a prime (3131241121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126681 + ... + 149366.

It is an arithmetic number, because the mean of its divisors is an integer number (276048000).

Almost surely, 2^3131201121 is an apocalyptic number.

It is an amenable number.

3131201121 is a deficient number, since it is larger than the sum of its proper divisors (1285566879).

3131201121 is a wasteful number, since it uses less digits than its factorization.

3131201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276268.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 3131201121 is about 55957.1364617597. The cubic root of 3131201121 is about 1462.9752801687.

Adding to 3131201121 its reverse (1211021313), we get a palindrome (4342222434).

The spelling of 3131201121 in words is "three billion, one hundred thirty-one million, two hundred one thousand, one hundred twenty-one".