131316391 has 4 divisors (see below), whose sum is σ = 138227800. Its totient is φ = 124404984.

The previous prime is 131316371. The next prime is 131316397. The reversal of 131316391 is 193613131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193613131 = 4349 ⋅44519.

It is a cyclic number.

It is not a de Polignac number, because 131316391 - 2⁹ = 131315879 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 (131316397) 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, 3455676 + ... + 3455713.

It is an arithmetic number, because the mean of its divisors is an integer number (34556950).

Almost surely, 2^131316391 is an apocalyptic number.

131316391 is a deficient number, since it is larger than the sum of its proper divisors (6911409).

131316391 is an equidigital number, since it uses as much as digits as its factorization.

131316391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6911408.

The product of its digits is 1458, while the sum is 28.

The square root of 131316391 is about 11459.3364118521. The cubic root of 131316391 is about 508.2838523069.

The spelling of 131316391 in words is "one hundred thirty-one million, three hundred sixteen thousand, three hundred ninety-one".