131687 has 2 divisors, whose sum is σ = 131688. Its totient is φ = 131686.

The previous prime is 131671. The next prime is 131701. The reversal of 131687 is 786131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131687 - 2⁴ = 131671 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 131687.

It is not a weakly prime, because it can be changed into another prime (131617) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65843 + 65844.

It is an arithmetic number, because the mean of its divisors is an integer number (65844).

2¹³¹⁶⁸⁷ is an apocalyptic number.

131687 is a deficient number, since it is larger than the sum of its proper divisors (1).

131687 is an equidigital number, since it uses as much as digits as its factorization.

131687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 131687 is about 362.8870347643. The cubic root of 131687 is about 50.8761572902.

It can be divided in two parts, 131 and 687, that added together give a palindrome (818).

The spelling of 131687 in words is "one hundred thirty-one thousand, six hundred eighty-seven".