1312698391 has 8 divisors (see below), whose sum is σ = 1411188480. Its totient is φ = 1217148408.

The previous prime is 1312698377. The next prime is 1312698403. The reversal of 1312698391 is 1938962131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312698391 - 2⁹ = 1312697879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312698301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734101 + ... + 735886.

It is an arithmetic number, because the mean of its divisors is an integer number (176398560).

Almost surely, 2^1312698391 is an apocalyptic number.

1312698391 is a deficient number, since it is larger than the sum of its proper divisors (98490089).

1312698391 is a wasteful number, since it uses less digits than its factorization.

1312698391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470053.

The product of its digits is 69984, while the sum is 43.

The square root of 1312698391 is about 36231.1798179413. The cubic root of 1312698391 is about 1094.9349477280.

The spelling of 1312698391 in words is "one billion, three hundred twelve million, six hundred ninety-eight thousand, three hundred ninety-one".