231311321131 has 12 divisors (see below), whose sum is σ = 258419348992. Its totient is φ = 206835750000.

The previous prime is 231311321119. The next prime is 231311321179. The reversal of 231311321131 is 131123113132.

It is a de Polignac number, because none of the positive numbers 2^k-231311321131 is a prime.

It is a super-2 number, since 2×231311321131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231311321191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15661995 + ... + 15676756.

Almost surely, 2^231311321131 is an apocalyptic number.

231311321131 is a deficient number, since it is larger than the sum of its proper divisors (27108027861).

231311321131 is a wasteful number, since it uses less digits than its factorization.

231311321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31338834 (or 31338823 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

Adding to 231311321131 its reverse (131123113132), we get a palindrome (362434434263).

The spelling of 231311321131 in words is "two hundred thirty-one billion, three hundred eleven million, three hundred twenty-one thousand, one hundred thirty-one".