129139807591 has 4 divisors (see below), whose sum is σ = 129185882392. Its totient is φ = 129093732792.

The previous prime is 129139807561. The next prime is 129139807661. The reversal of 129139807591 is 195708931921.

It is a happy number.

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 129139807591 - 2⁹ = 129139807079 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 (129139807541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23033196 + ... + 23038801.

It is an arithmetic number, because the mean of its divisors is an integer number (32296470598).

Almost surely, 2^129139807591 is an apocalyptic number.

129139807591 is a deficient number, since it is larger than the sum of its proper divisors (46074801).

129139807591 is an equidigital number, since it uses as much as digits as its factorization.

129139807591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46074800.

The product of its (nonzero) digits is 1224720, while the sum is 55.

The spelling of 129139807591 in words is "one hundred twenty-nine billion, one hundred thirty-nine million, eight hundred seven thousand, five hundred ninety-one".