131317519 has 4 divisors (see below), whose sum is σ = 135553600. Its totient is φ = 127081440.

The previous prime is 131317507. The next prime is 131317523. The reversal of 131317519 is 915713131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131317519 is a prime.

It is a super-2 number, since 2×131317519² = 34488581592630722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 4236049 = 131317519 / (1 + 3 + 1 + 3 + 1 + 7 + 5 + 1 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131317559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2117994 + ... + 2118055.

It is an arithmetic number, because the mean of its divisors is an integer number (33888400).

Almost surely, 2^131317519 is an apocalyptic number.

131317519 is a deficient number, since it is larger than the sum of its proper divisors (4236081).

131317519 is an equidigital number, since it uses as much as digits as its factorization.

131317519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4236080.

The product of its digits is 2835, while the sum is 31.

The square root of 131317519 is about 11459.3856292560. The cubic root of 131317519 is about 508.2853076788.

The spelling of 131317519 in words is "one hundred thirty-one million, three hundred seventeen thousand, five hundred nineteen".