129159887 has 4 divisors (see below), whose sum is σ = 131596920. Its totient is φ = 126722856.

The previous prime is 129159883. The next prime is 129159907. The reversal of 129159887 is 788951921.

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

It is a cyclic number.

It is not a de Polignac number, because 129159887 - 2² = 129159883 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 (129159883) 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, 1218437 + ... + 1218542.

It is an arithmetic number, because the mean of its divisors is an integer number (32899230).

Almost surely, 2^129159887 is an apocalyptic number.

129159887 is a deficient number, since it is larger than the sum of its proper divisors (2437033).

129159887 is an equidigital number, since it uses as much as digits as its factorization.

129159887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2437032.

The product of its digits is 362880, while the sum is 50.

The square root of 129159887 is about 11364.8531446737. The cubic root of 129159887 is about 505.4861012307.

The spelling of 129159887 in words is "one hundred twenty-nine million, one hundred fifty-nine thousand, eight hundred eighty-seven".