129975475 has 12 divisors (see below), whose sum is σ = 184194064. Its totient is φ = 89125920.

The previous prime is 129975473. The next prime is 129975481. The reversal of 129975475 is 574579921.

It is a happy number.

It is not a de Polignac number, because 129975475 - 2¹ = 129975473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129975473) 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 11 ways as a sum of consecutive naturals, for example, 371184 + ... + 371533.

Almost surely, 2^129975475 is an apocalyptic number.

129975475 is a deficient number, since it is larger than the sum of its proper divisors (54218589).

129975475 is an equidigital number, since it uses as much as digits as its factorization.

129975475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742734 (or 742729 counting only the distinct ones).

The product of its digits is 793800, while the sum is 49.

The square root of 129975475 is about 11400.6787078665. The cubic root of 129975475 is about 506.5478438369.

The spelling of 129975475 in words is "one hundred twenty-nine million, nine hundred seventy-five thousand, four hundred seventy-five".