130931587 has 4 divisors (see below), whose sum is σ = 132509160. Its totient is φ = 129354016.

The previous prime is 130931503. The next prime is 130931611. The reversal of 130931587 is 785139031.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-130931587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (130931687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788662 + ... + 788827.

It is an arithmetic number, because the mean of its divisors is an integer number (33127290).

Almost surely, 2^130931587 is an apocalyptic number.

130931587 is a deficient number, since it is larger than the sum of its proper divisors (1577573).

130931587 is an equidigital number, since it uses as much as digits as its factorization.

130931587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577572.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 130931587 is about 11442.5341161825. The cubic root of 130931587 is about 507.7868820535.

It can be divided in two parts, 1309 and 31587, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 130931587 in words is "one hundred thirty million, nine hundred thirty-one thousand, five hundred eighty-seven".