131587 has 4 divisors (see below), whose sum is σ = 132496. Its totient is φ = 130680.

The previous prime is 131581. The next prime is 131591. The reversal of 131587 is 785131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 131587 - 2¹¹ = 129539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131581) 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, 183 + ... + 544.

It is an arithmetic number, because the mean of its divisors is an integer number (33124).

2¹³¹⁵⁸⁷ is an apocalyptic number.

131587 is a deficient number, since it is larger than the sum of its proper divisors (909).

131587 is an equidigital number, since it uses as much as digits as its factorization.

131587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908.

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

The square root of 131587 is about 362.7492246718. The cubic root of 131587 is about 50.8632759781.

It can be divided in two parts, 13 and 1587, that added together give a square (1600 = 40²).

The spelling of 131587 in words is "one hundred thirty-one thousand, five hundred eighty-seven".