1311313191 has 8 divisors (see below), whose sum is σ = 1824435840. Its totient is φ = 836199672.

The previous prime is 1311313183. The next prime is 1311313229. The reversal of 1311313191 is 1913131131.

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

It is not a de Polignac number, because 1311313191 - 2³ = 1311313183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311313111) 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, 9502201 + ... + 9502338.

It is an arithmetic number, because the mean of its divisors is an integer number (228054480).

Almost surely, 2^1311313191 is an apocalyptic number.

1311313191 is a deficient number, since it is larger than the sum of its proper divisors (513122649).

1311313191 is a wasteful number, since it uses less digits than its factorization.

1311313191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19004565.

The product of its digits is 243, while the sum is 24.

The square root of 1311313191 is about 36212.0586407346. The cubic root of 1311313191 is about 1094.5496757560.

The spelling of 1311313191 in words is "one billion, three hundred eleven million, three hundred thirteen thousand, one hundred ninety-one".