131395987 has 4 divisors (see below), whose sum is σ = 137108880. Its totient is φ = 125683096.

The previous prime is 131395981. The next prime is 131395993. The reversal of 131395987 is 789593131.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (131395981) and next prime (131395993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131395987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131395981) 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, 2856412 + ... + 2856457.

It is an arithmetic number, because the mean of its divisors is an integer number (34277220).

Almost surely, 2^131395987 is an apocalyptic number.

131395987 is a deficient number, since it is larger than the sum of its proper divisors (5712893).

131395987 is an equidigital number, since it uses as much as digits as its factorization.

131395987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5712892.

The product of its digits is 204120, while the sum is 46.

The square root of 131395987 is about 11462.8088617058. The cubic root of 131395987 is about 508.3865284712.

The spelling of 131395987 in words is "one hundred thirty-one million, three hundred ninety-five thousand, nine hundred eighty-seven".