131599769 has 4 divisors (see below), whose sum is σ = 150399744. Its totient is φ = 112799796.

The previous prime is 131599759. The next prime is 131599777. The reversal of 131599769 is 967995131.

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 131599769 - 2⁸ = 131599513 is a prime.

It is a super-2 number, since 2×131599769² = 34636998401706722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131599729) 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, 9399977 + ... + 9399990.

It is an arithmetic number, because the mean of its divisors is an integer number (37599936).

Almost surely, 2^131599769 is an apocalyptic number.

It is an amenable number.

131599769 is a deficient number, since it is larger than the sum of its proper divisors (18799975).

131599769 is an equidigital number, since it uses as much as digits as its factorization.

131599769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18799974.

The product of its digits is 459270, while the sum is 50.

The square root of 131599769 is about 11471.6942515044. The cubic root of 131599769 is about 508.6492115618.

The spelling of 131599769 in words is "one hundred thirty-one million, five hundred ninety-nine thousand, seven hundred sixty-nine".