1312331231 has 2 divisors, whose sum is σ = 1312331232. Its totient is φ = 1312331230.

The previous prime is 1312331219. The next prime is 1312331243. The reversal of 1312331231 is 1321332131.

It is a balanced prime because it is at equal distance from previous prime (1312331219) and next prime (1312331243).

It is a cyclic number.

It is not a de Polignac number, because 1312331231 - 2²⁶ = 1245222367 is a prime.

It is a super-2 number, since 2×1312331231² = 3444426519715950722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312331131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656165615 + 656165616.

It is an arithmetic number, because the mean of its divisors is an integer number (656165616).

Almost surely, 2^1312331231 is an apocalyptic number.

1312331231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312331231 is an equidigital number, since it uses as much as digits as its factorization.

1312331231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 20.

The square root of 1312331231 is about 36226.1125571044. The cubic root of 1312331231 is about 1094.8328542578.

Adding to 1312331231 its reverse (1321332131), we get a palindrome (2633663362).

The spelling of 1312331231 in words is "one billion, three hundred twelve million, three hundred thirty-one thousand, two hundred thirty-one".