131987 has 4 divisors (see below), whose sum is σ = 133560. Its totient is φ = 130416.

The previous prime is 131969. The next prime is 132001. The reversal of 131987 is 789131.

131987 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131987 - 2⁸ = 131731 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 131987.

It is not an unprimeable number, because it can be changed into a prime (131927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653 + ... + 830.

It is an arithmetic number, because the mean of its divisors is an integer number (33390).

2¹³¹⁹⁸⁷ is an apocalyptic number.

131987 is a deficient number, since it is larger than the sum of its proper divisors (1573).

131987 is an equidigital number, since it uses as much as digits as its factorization.

131987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572.

The product of its digits is 1512, while the sum is 29.

The square root of 131987 is about 363.3001513900. The cubic root of 131987 is about 50.9147621426.

The spelling of 131987 in words is "one hundred thirty-one thousand, nine hundred eighty-seven".