129998601 has 20 divisors (see below), whose sum is σ = 195339012. Its totient is φ = 86155488.

The previous prime is 129998581. The next prime is 129998623. The reversal of 129998601 is 106899921.

It can be written as a sum of positive squares in 2 ways, for example, as 112784400 + 17214201 = 10620^2 + 4149^2 .

It is not a de Polignac number, because 129998601 - 2⁶ = 129998537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129998101) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9375 + ... + 18651.

Almost surely, 2^129998601 is an apocalyptic number.

It is an amenable number.

129998601 is a deficient number, since it is larger than the sum of its proper divisors (65340411).

129998601 is an equidigital number, since it uses as much as digits as its factorization.

129998601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9462 (or 9453 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 129998601 is about 11401.6929006179. The cubic root of 129998601 is about 506.5778847113.

The spelling of 129998601 in words is "one hundred twenty-nine million, nine hundred ninety-eight thousand, six hundred one".