130931987 has 2 divisors, whose sum is σ = 130931988. Its totient is φ = 130931986.

The previous prime is 130931981. The next prime is 130932017. The reversal of 130931987 is 789139031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 130931987 - 2⁴ = 130931971 is a prime.

It is not a weakly prime, because it can be changed into another prime (130931981) 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 as a sum of consecutive naturals, namely, 65465993 + 65465994.

It is an arithmetic number, because the mean of its divisors is an integer number (65465994).

Almost surely, 2^130931987 is an apocalyptic number.

130931987 is a deficient number, since it is larger than the sum of its proper divisors (1).

130931987 is an equidigital number, since it uses as much as digits as its factorization.

130931987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 130931987 is about 11442.5515948149. The cubic root of 130931987 is about 507.7873991544.

The spelling of 130931987 in words is "one hundred thirty million, nine hundred thirty-one thousand, nine hundred eighty-seven".