131711987 has 8 divisors (see below), whose sum is σ = 144569280. Its totient is φ = 119001960.

The previous prime is 131711981. The next prime is 131711989. The reversal of 131711987 is 789117131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-131711987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131711987.

It is not an unprimeable number, because it can be changed into a prime (131711981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34937 + ... + 38522.

It is an arithmetic number, because the mean of its divisors is an integer number (18071160).

Almost surely, 2^131711987 is an apocalyptic number.

131711987 is a deficient number, since it is larger than the sum of its proper divisors (12857293).

131711987 is a wasteful number, since it uses less digits than its factorization.

131711987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73633.

The product of its digits is 10584, while the sum is 38.

The square root of 131711987 is about 11476.5842915042. The cubic root of 131711987 is about 508.7937492537.

The spelling of 131711987 in words is "one hundred thirty-one million, seven hundred eleven thousand, nine hundred eighty-seven".