129257197 has 8 divisors (see below), whose sum is σ = 134611200. Its totient is φ = 123977280.

The previous prime is 129257189. The next prime is 129257201. The reversal of 129257197 is 791752921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129257197 - 2³ = 129257189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129257797) 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 7 ways as a sum of consecutive naturals, for example, 14947 + ... + 21952.

It is an arithmetic number, because the mean of its divisors is an integer number (16826400).

Almost surely, 2^129257197 is an apocalyptic number.

It is an amenable number.

129257197 is a deficient number, since it is larger than the sum of its proper divisors (5354003).

129257197 is a wasteful number, since it uses less digits than its factorization.

129257197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37043.

The product of its digits is 79380, while the sum is 43.

The square root of 129257197 is about 11369.1335201941. The cubic root of 129257197 is about 505.6130150008.

The spelling of 129257197 in words is "one hundred twenty-nine million, two hundred fifty-seven thousand, one hundred ninety-seven".