231312313131 has 4 divisors (see below), whose sum is σ = 308416417512. Its totient is φ = 154208208752.

The previous prime is 231312313129. The next prime is 231312313147. The reversal of 231312313131 is 131313213132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231312313131 - 2¹ = 231312313129 is a prime.

It is a super-2 number, since 2×231312313131² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231312313171) 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, 38552052186 + ... + 38552052191.

It is an arithmetic number, because the mean of its divisors is an integer number (77104104378).

Almost surely, 2^231312313131 is an apocalyptic number.

231312313131 is a deficient number, since it is larger than the sum of its proper divisors (77104104381).

231312313131 is an equidigital number, since it uses as much as digits as its factorization.

231312313131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77104104380.

The product of its digits is 972, while the sum is 24.

Adding to 231312313131 its reverse (131313213132), we get a palindrome (362625526263).

Subtracting from 231312313131 its reverse (131313213132), we obtain a palindrome (99999099999).

The spelling of 231312313131 in words is "two hundred thirty-one billion, three hundred twelve million, three hundred thirteen thousand, one hundred thirty-one".