131516317 has 4 divisors (see below), whose sum is σ = 134574880. Its totient is φ = 128457756.

The previous prime is 131516269. The next prime is 131516321. The reversal of 131516317 is 713615131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131516317 - 2¹¹ = 131514269 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 (131516117) 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, 1529217 + ... + 1529302.

It is an arithmetic number, because the mean of its divisors is an integer number (33643720).

Almost surely, 2^131516317 is an apocalyptic number.

It is an amenable number.

131516317 is a deficient number, since it is larger than the sum of its proper divisors (3058563).

131516317 is an equidigital number, since it uses as much as digits as its factorization.

131516317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3058562.

The product of its digits is 1890, while the sum is 28.

The square root of 131516317 is about 11468.0563741202. The cubic root of 131516317 is about 508.5416714295.

The spelling of 131516317 in words is "one hundred thirty-one million, five hundred sixteen thousand, three hundred seventeen".