1312809031 has 2 divisors, whose sum is σ = 1312809032. Its totient is φ = 1312809030.

The previous prime is 1312809023. The next prime is 1312809073. The reversal of 1312809031 is 1309082131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312809031 - 2³ = 1312809023 is a prime.

It is a super-2 number, since 2×1312809031² = 3446935103750317922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312809011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656404515 + 656404516.

It is an arithmetic number, because the mean of its divisors is an integer number (656404516).

Almost surely, 2^1312809031 is an apocalyptic number.

1312809031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312809031 is an equidigital number, since it uses as much as digits as its factorization.

1312809031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1312809031 is about 36232.7066474477. The cubic root of 1312809031 is about 1094.9657088432.

The spelling of 1312809031 in words is "one billion, three hundred twelve million, eight hundred nine thousand, thirty-one".