1312991039 has 4 divisors (see below), whose sum is σ = 1390225824. Its totient is φ = 1235756256.

The previous prime is 1312991033. The next prime is 1312991047. The reversal of 1312991039 is 9301992131.

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 1312991039 - 2¹² = 1312986943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312990993 and 1312991011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312991033) 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 in 3 ways as a sum of consecutive naturals, for example, 38617367 + ... + 38617400.

It is an arithmetic number, because the mean of its divisors is an integer number (347556456).

Almost surely, 2^1312991039 is an apocalyptic number.

1312991039 is a deficient number, since it is larger than the sum of its proper divisors (77234785).

1312991039 is an equidigital number, since it uses as much as digits as its factorization.

1312991039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77234784.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 1312991039 is about 36235.2182137765. The cubic root of 1312991039 is about 1095.0163085636.

The spelling of 1312991039 in words is "one billion, three hundred twelve million, nine hundred ninety-one thousand, thirty-nine".