131631685 has 8 divisors (see below), whose sum is σ = 158022936. Its totient is φ = 105262080.

The previous prime is 131631659. The next prime is 131631713. The reversal of 131631685 is 586136131.

It can be written as a sum of positive squares in 4 ways, for example, as 7219969 + 124411716 = 2687^2 + 11154^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131631685 - 2⁹ = 131631173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131631685.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14925 + ... + 22045.

It is an arithmetic number, because the mean of its divisors is an integer number (19752867).

Almost surely, 2^131631685 is an apocalyptic number.

It is an amenable number.

131631685 is a deficient number, since it is larger than the sum of its proper divisors (26391251).

131631685 is an equidigital number, since it uses as much as digits as its factorization.

131631685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10823.

The product of its digits is 12960, while the sum is 34.

The square root of 131631685 is about 11473.0852432988. The cubic root of 131631685 is about 508.6903279867.

The spelling of 131631685 in words is "one hundred thirty-one million, six hundred thirty-one thousand, six hundred eighty-five".