31011331121 has 4 divisors (see below), whose sum is σ = 31732524912. Its totient is φ = 30290137332.

The previous prime is 31011331093. The next prime is 31011331157. The reversal of 31011331121 is 12113311013.

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 a de Polignac number, because none of the positive numbers 2^k-31011331121 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 31011331121.

It is not an unprimeable number, because it can be changed into a prime (31011331921) 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, 360596831 + ... + 360596916.

It is an arithmetic number, because the mean of its divisors is an integer number (7933131228).

Almost surely, 2^31011331121 is an apocalyptic number.

It is an amenable number.

31011331121 is a deficient number, since it is larger than the sum of its proper divisors (721193791).

31011331121 is an equidigital number, since it uses as much as digits as its factorization.

31011331121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721193790.

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

Adding to 31011331121 its reverse (12113311013), we get a palindrome (43124642134).

The spelling of 31011331121 in words is "thirty-one billion, eleven million, three hundred thirty-one thousand, one hundred twenty-one".