131799685 has 4 divisors (see below), whose sum is σ = 158159628. Its totient is φ = 105439744.

The previous prime is 131799667. The next prime is 131799709. The reversal of 131799685 is 586997131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34363044 + 97436641 = 5862^2 + 9871^2 .

It is a cyclic number.

It is not a de Polignac number, because 131799685 - 2²¹ = 129702533 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13179964 + ... + 13179973.

It is an arithmetic number, because the mean of its divisors is an integer number (39539907).

Almost surely, 2^131799685 is an apocalyptic number.

It is an amenable number.

131799685 is a deficient number, since it is larger than the sum of its proper divisors (26359943).

131799685 is an equidigital number, since it uses as much as digits as its factorization.

131799685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26359942.

The product of its digits is 408240, while the sum is 49.

The square root of 131799685 is about 11480.4043918322. The cubic root of 131799685 is about 508.9066478483.

The spelling of 131799685 in words is "one hundred thirty-one million, seven hundred ninety-nine thousand, six hundred eighty-five".