131685 has 8 divisors (see below), whose sum is σ = 210720. Its totient is φ = 70224.

The previous prime is 131671. The next prime is 131687. The reversal of 131685 is 586131.

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

It is not a de Polignac number, because 131685 - 2¹³ = 123493 is a prime.

131685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4375 + ... + 4404.

It is an arithmetic number, because the mean of its divisors is an integer number (26340).

2¹³¹⁶⁸⁵ is an apocalyptic number.

131685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131685 is a deficient number, since it is larger than the sum of its proper divisors (79035).

131685 is an equidigital number, since it uses as much as digits as its factorization.

131685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8787.

The product of its digits is 720, while the sum is 24.

The square root of 131685 is about 362.8842790753. The cubic root of 131685 is about 50.8758997279.

The spelling of 131685 in words is "one hundred thirty-one thousand, six hundred eighty-five".