129975097 has 6 divisors (see below), whose sum is σ = 151195578. Its totient is φ = 111407184.

The previous prime is 129975061. The next prime is 129975137. The reversal of 129975097 is 790579921.

It can be written as a sum of positive squares in only one way, i.e., 125910841 + 4064256 = 11221^2 + 2016^2 .

It is not a de Polignac number, because 129975097 - 2²³ = 121586489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 2652553 = 129975097 / (1 + 2 + 9 + 9 + 7 + 5 + 0 + 9 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129975097.

It is not an unprimeable number, because it can be changed into a prime (129975007) 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 5 ways as a sum of consecutive naturals, for example, 1326228 + ... + 1326325.

It is an arithmetic number, because the mean of its divisors is an integer number (25199263).

Almost surely, 2^129975097 is an apocalyptic number.

It is an amenable number.

129975097 is a deficient number, since it is larger than the sum of its proper divisors (21220481).

129975097 is an equidigital number, since it uses as much as digits as its factorization.

129975097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652567 (or 2652560 counting only the distinct ones).

The product of its (nonzero) digits is 357210, while the sum is 49.

The square root of 129975097 is about 11400.6621298940. The cubic root of 129975097 is about 506.5473527820.

The spelling of 129975097 in words is "one hundred twenty-nine million, nine hundred seventy-five thousand, ninety-seven".