1312231031 has 2 divisors, whose sum is σ = 1312231032. Its totient is φ = 1312231030.

The previous prime is 1312231027. The next prime is 1312231049. The reversal of 1312231031 is 1301322131.

It is a weak prime.

It is an emirp because it is prime and its reverse (1301322131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312231031 - 2² = 1312231027 is a prime.

It is a super-2 number, since 2×1312231031² = 3443900557438645922, 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 (1312233031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656115515 + 656115516.

It is an arithmetic number, because the mean of its divisors is an integer number (656115516).

Almost surely, 2^1312231031 is an apocalyptic number.

1312231031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312231031 is an equidigital number, since it uses as much as digits as its factorization.

1312231031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1312231031 is about 36224.7295504052. The cubic root of 1312231031 is about 1094.8049890762.

Adding to 1312231031 its reverse (1301322131), we get a palindrome (2613553162).

The spelling of 1312231031 in words is "one billion, three hundred twelve million, two hundred thirty-one thousand, thirty-one".