130991687 has 2 divisors, whose sum is σ = 130991688. Its totient is φ = 130991686.

The previous prime is 130991683. The next prime is 130991699. The reversal of 130991687 is 786199031.

It is a weak prime.

It is an emirp because it is prime and its reverse (786199031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 130991687 - 2² = 130991683 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130991683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65495843 + 65495844.

It is an arithmetic number, because the mean of its divisors is an integer number (65495844).

Almost surely, 2^130991687 is an apocalyptic number.

130991687 is a deficient number, since it is larger than the sum of its proper divisors (1).

130991687 is an equidigital number, since it uses as much as digits as its factorization.

130991687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 130991687 is about 11445.1599814070. The cubic root of 130991687 is about 507.8645646663.

The spelling of 130991687 in words is "one hundred thirty million, nine hundred ninety-one thousand, six hundred eighty-seven".