131785 has 4 divisors (see below), whose sum is σ = 158148. Its totient is φ = 105424.

The previous prime is 131783. The next prime is 131797. The reversal of 131785 is 587131.

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 48841 + 82944 = 221^2 + 288^2 .

It is a cyclic number.

It is not a de Polignac number, because 131785 - 2¹ = 131783 is a prime.

It is a Duffinian number.

131785 is a lucky number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (131783) 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, 13174 + ... + 13183.

It is an arithmetic number, because the mean of its divisors is an integer number (39537).

2¹³¹⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

131785 is a deficient number, since it is larger than the sum of its proper divisors (26363).

131785 is an equidigital number, since it uses as much as digits as its factorization.

131785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26362.

The product of its digits is 840, while the sum is 25.

The square root of 131785 is about 363.0220378985. The cubic root of 131785 is about 50.8887746509. Note that the first 3 decimals are identical.

The spelling of 131785 in words is "one hundred thirty-one thousand, seven hundred eighty-five".