231231120113 has 4 divisors (see below), whose sum is σ = 264264137280. Its totient is φ = 198198102948.

The previous prime is 231231120089. The next prime is 231231120139. The reversal of 231231120113 is 311021132132.

It is a happy number.

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 231231120113 - 2²⁰ = 231230071537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231231120163) 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, 16516508573 + ... + 16516508586.

It is an arithmetic number, because the mean of its divisors is an integer number (66066034320).

Almost surely, 2^231231120113 is an apocalyptic number.

It is an amenable number.

231231120113 is a deficient number, since it is larger than the sum of its proper divisors (33033017167).

231231120113 is an equidigital number, since it uses as much as digits as its factorization.

231231120113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33033017166.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 231231120113 its reverse (311021132132), we get a palindrome (542252252245).

The spelling of 231231120113 in words is "two hundred thirty-one billion, two hundred thirty-one million, one hundred twenty thousand, one hundred thirteen".