129152779 has 12 divisors (see below), whose sum is σ = 153735384. Its totient is φ = 108126144.

The previous prime is 129152767. The next prime is 129152783. The reversal of 129152779 is 977251921.

It is not a de Polignac number, because 129152779 - 2⁷ = 129152651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129152719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28542 + ... + 32755.

It is an arithmetic number, because the mean of its divisors is an integer number (12811282).

Almost surely, 2^129152779 is an apocalyptic number.

129152779 is a deficient number, since it is larger than the sum of its proper divisors (24582605).

129152779 is an equidigital number, since it uses as much as digits as its factorization.

129152779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61354 (or 61347 counting only the distinct ones).

The product of its digits is 79380, while the sum is 43.

The square root of 129152779 is about 11364.5404218560. The cubic root of 129152779 is about 505.4768283282.

The spelling of 129152779 in words is "one hundred twenty-nine million, one hundred fifty-two thousand, seven hundred seventy-nine".