129056279 has 4 divisors (see below), whose sum is σ = 140788680. Its totient is φ = 117323880.

The previous prime is 129056273. The next prime is 129056309. The reversal of 129056279 is 972650921.

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 129056279 - 2⁸ = 129056023 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 (129056273) 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, 5866184 + ... + 5866205.

It is an arithmetic number, because the mean of its divisors is an integer number (35197170).

Almost surely, 2^129056279 is an apocalyptic number.

129056279 is a deficient number, since it is larger than the sum of its proper divisors (11732401).

129056279 is a wasteful number, since it uses less digits than its factorization.

129056279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11732400.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 129056279 is about 11360.2939662669. The cubic root of 129056279 is about 505.3509033886.

The spelling of 129056279 in words is "one hundred twenty-nine million, fifty-six thousand, two hundred seventy-nine".