131437987 has 8 divisors (see below), whose sum is σ = 134111232. Its totient is φ = 128785800.

The previous prime is 131437979. The next prime is 131437993. The reversal of 131437987 is 789734131.

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

It is a cyclic number.

It is not a de Polignac number, because 131437987 - 2³ = 131437979 is a prime.

It is a super-2 number, since 2×131437987² = 34551888853224338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131437087) 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, 7662 + ... + 17932.

It is an arithmetic number, because the mean of its divisors is an integer number (16763904).

Almost surely, 2^131437987 is an apocalyptic number.

131437987 is a deficient number, since it is larger than the sum of its proper divisors (2673245).

131437987 is a wasteful number, since it uses less digits than its factorization.

131437987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10529.

The product of its digits is 127008, while the sum is 43.

The square root of 131437987 is about 11464.6407270355. The cubic root of 131437987 is about 508.4406903474.

The spelling of 131437987 in words is "one hundred thirty-one million, four hundred thirty-seven thousand, nine hundred eighty-seven".