129139577 has 4 divisors (see below), whose sum is σ = 147588096. Its totient is φ = 110691060.

The previous prime is 129139559. The next prime is 129139601. The reversal of 129139577 is 775931921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129139577 - 2⁶ = 129139513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129139547) 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, 9224249 + ... + 9224262.

It is an arithmetic number, because the mean of its divisors is an integer number (36897024).

Almost surely, 2^129139577 is an apocalyptic number.

It is an amenable number.

129139577 is a deficient number, since it is larger than the sum of its proper divisors (18448519).

129139577 is an equidigital number, since it uses as much as digits as its factorization.

129139577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18448518.

The product of its digits is 119070, while the sum is 44.

The square root of 129139577 is about 11363.9595652220. The cubic root of 129139577 is about 505.4596044571.

The spelling of 129139577 in words is "one hundred twenty-nine million, one hundred thirty-nine thousand, five hundred seventy-seven".