129975242 has 4 divisors (see below), whose sum is σ = 194962866. Its totient is φ = 64987620.

The previous prime is 129975221. The next prime is 129975269. The reversal of 129975242 is 242579921.

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

It can be written as a sum of positive squares in only one way, i.e., 89283601 + 40691641 = 9449^2 + 6379^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129975242.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 32493809 + ... + 32493812.

Almost surely, 2^129975242 is an apocalyptic number.

129975242 is a deficient number, since it is larger than the sum of its proper divisors (64987624).

129975242 is an equidigital number, since it uses as much as digits as its factorization.

129975242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64987623.

The product of its digits is 90720, while the sum is 41.

The square root of 129975242 is about 11400.6684891720. The cubic root of 129975242 is about 506.5475411498.

The spelling of 129975242 in words is "one hundred twenty-nine million, nine hundred seventy-five thousand, two hundred forty-two".