129118442 has 4 divisors (see below), whose sum is σ = 193677666. Its totient is φ = 64559220.

The previous prime is 129118421. The next prime is 129118459. The reversal of 129118442 is 244811921.

It is a happy number.

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., 117700801 + 11417641 = 10849^2 + 3379^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129118399 and 129118408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32279609 + ... + 32279612.

Almost surely, 2^129118442 is an apocalyptic number.

129118442 is a deficient number, since it is larger than the sum of its proper divisors (64559224).

129118442 is an equidigital number, since it uses as much as digits as its factorization.

129118442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64559223.

The product of its digits is 4608, while the sum is 32.

The square root of 129118442 is about 11363.0296136198. The cubic root of 129118442 is about 505.4320284244.

The spelling of 129118442 in words is "one hundred twenty-nine million, one hundred eighteen thousand, four hundred forty-two".