129599997 has 8 divisors (see below), whose sum is σ = 173012256. Its totient is φ = 86293872.

The previous prime is 129599983. The next prime is 129600001. The reversal of 129599997 is 799995921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129599997 - 2²⁰ = 128551421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129599997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129599947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23638 + ... + 28599.

It is an arithmetic number, because the mean of its divisors is an integer number (21626532).

Almost surely, 2^129599997 is an apocalyptic number.

It is an amenable number.

129599997 is a deficient number, since it is larger than the sum of its proper divisors (43412259).

129599997 is an equidigital number, since it uses as much as digits as its factorization.

129599997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53067.

The product of its digits is 4133430, while the sum is 60.

The square root of 129599997 is about 11384.1994448446. The cubic root of 129599997 is about 506.0595952763.

The spelling of 129599997 in words is "one hundred twenty-nine million, five hundred ninety-nine thousand, nine hundred ninety-seven".