231311013121 has 4 divisors (see below), whose sum is σ = 231765455700. Its totient is φ = 230856570544.

The previous prime is 231311013029. The next prime is 231311013137. The reversal of 231311013121 is 121310113132.

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 205698531600 + 25612481521 = 453540^2 + 160039^2 .

It is a cyclic number.

It is not a de Polignac number, because 231311013121 - 2¹⁹ = 231310488833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231311013181) 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, 227220526 + ... + 227221543.

It is an arithmetic number, because the mean of its divisors is an integer number (57941363925).

Almost surely, 2^231311013121 is an apocalyptic number.

It is an amenable number.

231311013121 is a deficient number, since it is larger than the sum of its proper divisors (454442579).

231311013121 is an equidigital number, since it uses as much as digits as its factorization.

231311013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454442578.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 231311013121 its reverse (121310113132), we get a palindrome (352621126253).

The spelling of 231311013121 in words is "two hundred thirty-one billion, three hundred eleven million, thirteen thousand, one hundred twenty-one".