3131131121 has 4 divisors (see below), whose sum is σ = 3184201200. Its totient is φ = 3078061044.

The previous prime is 3131131103. The next prime is 3131131139. The reversal of 3131131121 is 1211311313.

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 an interprime number because it is at equal distance from previous prime (3131131103) and next prime (3131131139).

It is a cyclic number.

It is not a de Polignac number, because 3131131121 - 2¹⁴ = 3131114737 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 3131131121.

It is not an unprimeable number, because it can be changed into a prime (3131131141) 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, 26534951 + ... + 26535068.

It is an arithmetic number, because the mean of its divisors is an integer number (796050300).

Almost surely, 2^3131131121 is an apocalyptic number.

It is an amenable number.

3131131121 is a deficient number, since it is larger than the sum of its proper divisors (53070079).

3131131121 is an equidigital number, since it uses as much as digits as its factorization.

3131131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53070078.

The product of its digits is 54, while the sum is 17.

The square root of 3131131121 is about 55956.5109795098. The cubic root of 3131131121 is about 1462.9643781720.

Adding to 3131131121 its reverse (1211311313), we get a palindrome (4342442434).

The spelling of 3131131121 in words is "three billion, one hundred thirty-one million, one hundred thirty-one thousand, one hundred twenty-one".