231311023121 has 4 divisors (see below), whose sum is σ = 231717545700. Its totient is φ = 230904500544.

The previous prime is 231311023093. The next prime is 231311023123. The reversal of 231311023121 is 121320113132.

It is a happy number.

231311023121 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.

It can be written as a sum of positive squares in 2 ways, for example, as 85432859521 + 145878163600 = 292289^2 + 381940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311023121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231311023093 and 231311023102.

It is not an unprimeable number, because it can be changed into a prime (231311023123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203260436 + ... + 203261573.

It is an arithmetic number, because the mean of its divisors is an integer number (57929386425).

Almost surely, 2^231311023121 is an apocalyptic number.

It is an amenable number.

231311023121 is a deficient number, since it is larger than the sum of its proper divisors (406522579).

231311023121 is an equidigital number, since it uses as much as digits as its factorization.

231311023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406522578.

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

Adding to 231311023121 its reverse (121320113132), we get a palindrome (352631136253).

The spelling of 231311023121 in words is "two hundred thirty-one billion, three hundred eleven million, twenty-three thousand, one hundred twenty-one".