1313486991 has 18 divisors (see below), whose sum is σ = 1917143592. Its totient is φ = 866574720.

The previous prime is 1313486989. The next prime is 1313487017. The reversal of 1313486991 is 1996843131.

It is not a de Polignac number, because 1313486991 - 2¹ = 1313486989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313486491) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 76926 + ... + 92436.

Almost surely, 2^1313486991 is an apocalyptic number.

1313486991 is a deficient number, since it is larger than the sum of its proper divisors (603656601).

1313486991 is an equidigital number, since it uses as much as digits as its factorization.

1313486991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15711 (or 15611 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 1313486991 is about 36242.0610754962. The cubic root of 1313486991 is about 1095.1541635700.

The spelling of 1313486991 in words is "one billion, three hundred thirteen million, four hundred eighty-six thousand, nine hundred ninety-one".