129975107 has 4 divisors (see below), whose sum is σ = 130013136. Its totient is φ = 129937080.

The previous prime is 129975061. The next prime is 129975137. The reversal of 129975107 is 701579921.

It is a happy number.

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 129975107 - 2⁸ = 129974851 is a prime.

It is a super-2 number, since 2×129975107² = 33787056879322898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129975137) 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, 13319 + ... + 20912.

It is an arithmetic number, because the mean of its divisors is an integer number (32503284).

Almost surely, 2^129975107 is an apocalyptic number.

129975107 is a deficient number, since it is larger than the sum of its proper divisors (38029).

129975107 is an equidigital number, since it uses as much as digits as its factorization.

129975107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38028.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 129975107 is about 11400.6625684650. The cubic root of 129975107 is about 506.5473657729.

The spelling of 129975107 in words is "one hundred twenty-nine million, nine hundred seventy-five thousand, one hundred seven".