129197158 has 4 divisors (see below), whose sum is σ = 193795740. Its totient is φ = 64598578.

The previous prime is 129197149. The next prime is 129197177. The reversal of 129197158 is 851791921.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32299288 + ... + 32299291.

It is an arithmetic number, because the mean of its divisors is an integer number (48448935).

Almost surely, 2^129197158 is an apocalyptic number.

129197158 is a deficient number, since it is larger than the sum of its proper divisors (64598582).

129197158 is an equidigital number, since it uses as much as digits as its factorization.

129197158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64598581.

The product of its digits is 45360, while the sum is 43.

The square root of 129197158 is about 11366.4927748184. The cubic root of 129197158 is about 505.5347183905.

The spelling of 129197158 in words is "one hundred twenty-nine million, one hundred ninety-seven thousand, one hundred fifty-eight".