131285 has 24 divisors (see below), whose sum is σ = 204288. Its totient is φ = 79200.

The previous prime is 131267. The next prime is 131293. The reversal of 131285 is 582131.

It is not a de Polignac number, because 131285 - 2⁶ = 131221 is a prime.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4220 + ... + 4250.

It is an arithmetic number, because the mean of its divisors is an integer number (8512).

2¹³¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

131285 is a deficient number, since it is larger than the sum of its proper divisors (73003).

131285 is a wasteful number, since it uses less digits than its factorization.

131285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 54 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 131285 is about 362.3327200240. The cubic root of 131285 is about 50.8243347564.

The spelling of 131285 in words is "one hundred thirty-one thousand, two hundred eighty-five".