129917687 has 4 divisors (see below), whose sum is σ = 136755480. Its totient is φ = 123079896.

The previous prime is 129917647. The next prime is 129917707. The reversal of 129917687 is 786719921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786719921 = 13 ⋅60516917.

It is a cyclic number.

It is not a de Polignac number, because 129917687 - 2²⁴ = 113140471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129917647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3418868 + ... + 3418905.

It is an arithmetic number, because the mean of its divisors is an integer number (34188870).

Almost surely, 2^129917687 is an apocalyptic number.

129917687 is a deficient number, since it is larger than the sum of its proper divisors (6837793).

129917687 is an equidigital number, since it uses as much as digits as its factorization.

129917687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837792.

The product of its digits is 381024, while the sum is 50.

The square root of 129917687 is about 11398.1440155843. The cubic root of 129917687 is about 506.4727611438.

The spelling of 129917687 in words is "one hundred twenty-nine million, nine hundred seventeen thousand, six hundred eighty-seven".