129717601 has 4 divisors (see below), whose sum is σ = 139695892. Its totient is φ = 119739312.

The previous prime is 129717587. The next prime is 129717613. The reversal of 129717601 is 106717921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43877376 + 85840225 = 6624^2 + 9265^2 .

It is a cyclic number.

It is not a de Polignac number, because 129717601 - 2⁷ = 129717473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129717661) 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, 4989126 + ... + 4989151.

It is an arithmetic number, because the mean of its divisors is an integer number (34923973).

Almost surely, 2^129717601 is an apocalyptic number.

It is an amenable number.

129717601 is a deficient number, since it is larger than the sum of its proper divisors (9978291).

129717601 is an equidigital number, since it uses as much as digits as its factorization.

129717601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9978290.

The product of its (nonzero) digits is 5292, while the sum is 34.

The square root of 129717601 is about 11389.3635028477. The cubic root of 129717601 is about 506.2126216166.

The spelling of 129717601 in words is "one hundred twenty-nine million, seven hundred seventeen thousand, six hundred one".