1316831191 has 4 divisors (see below), whose sum is σ = 1418125912. Its totient is φ = 1215536472.

The previous prime is 1316831161. The next prime is 1316831227. The reversal of 1316831191 is 1911386131.

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 1316831191 - 2²⁵ = 1283276759 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 (1316831111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50647341 + ... + 50647366.

It is an arithmetic number, because the mean of its divisors is an integer number (354531478).

Almost surely, 2^1316831191 is an apocalyptic number.

1316831191 is a deficient number, since it is larger than the sum of its proper divisors (101294721).

1316831191 is a wasteful number, since it uses less digits than its factorization.

1316831191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101294720.

The product of its digits is 3888, while the sum is 34.

The square root of 1316831191 is about 36288.1687468519. The cubic root of 1316831191 is about 1096.0828139846.

The spelling of 1316831191 in words is "one billion, three hundred sixteen million, eight hundred thirty-one thousand, one hundred ninety-one".