129773139 has 4 divisors (see below), whose sum is σ = 173030856. Its totient is φ = 86515424.

The previous prime is 129773129. The next prime is 129773141. The reversal of 129773139 is 931377921.

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 129773139 - 2⁹ = 129772627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129773139.

It is not an unprimeable number, because it can be changed into a prime (129773129) 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, 21628854 + ... + 21628859.

It is an arithmetic number, because the mean of its divisors is an integer number (43257714).

Almost surely, 2^129773139 is an apocalyptic number.

129773139 is a deficient number, since it is larger than the sum of its proper divisors (43257717).

129773139 is an equidigital number, since it uses as much as digits as its factorization.

129773139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43257716.

The product of its digits is 71442, while the sum is 42.

The square root of 129773139 is about 11391.8013939851. The cubic root of 129773139 is about 506.2848555181.

The spelling of 129773139 in words is "one hundred twenty-nine million, seven hundred seventy-three thousand, one hundred thirty-nine".