129113723 has 4 divisors (see below), whose sum is σ = 129169560. Its totient is φ = 129057888.

The previous prime is 129113711. The next prime is 129113737. The reversal of 129113723 is 327311921.

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 129113723 - 2⁴ = 129113707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129113773) 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, 24293 + ... + 29126.

It is an arithmetic number, because the mean of its divisors is an integer number (32292390).

Almost surely, 2^129113723 is an apocalyptic number.

129113723 is a deficient number, since it is larger than the sum of its proper divisors (55837).

129113723 is an equidigital number, since it uses as much as digits as its factorization.

129113723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55836.

The product of its digits is 2268, while the sum is 29.

The square root of 129113723 is about 11362.8219646354. The cubic root of 129113723 is about 505.4258708666.

The spelling of 129113723 in words is "one hundred twenty-nine million, one hundred thirteen thousand, seven hundred twenty-three".