1391310909 has 12 divisors (see below), whose sum is σ = 2024131200. Its totient is φ = 920866824.

The previous prime is 1391310859. The next prime is 1391310911. The reversal of 1391310909 is 9090131931.

It is not a de Polignac number, because 1391310909 - 2²⁰ = 1390262333 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391360909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 554829 + ... + 557330.

It is an arithmetic number, because the mean of its divisors is an integer number (168677600).

Almost surely, 2^1391310909 is an apocalyptic number.

It is an amenable number.

1391310909 is a deficient number, since it is larger than the sum of its proper divisors (632820291).

1391310909 is a wasteful number, since it uses less digits than its factorization.

1391310909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112304 (or 1112301 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The square root of 1391310909 is about 37300.2802804483. The cubic root of 1391310909 is about 1116.3697588689.

The spelling of 1391310909 in words is "one billion, three hundred ninety-one million, three hundred ten thousand, nine hundred nine".