161729197 has 8 divisors (see below), whose sum is σ = 194561600. Its totient is φ = 131328864.

The previous prime is 161729173. The next prime is 161729203. The reversal of 161729197 is 791927161.

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 161729197 - 2¹⁵ = 161696429 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 (161729107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607872 + ... + 608137.

It is an arithmetic number, because the mean of its divisors is an integer number (24320200).

Almost surely, 2^161729197 is an apocalyptic number.

It is an amenable number.

161729197 is a deficient number, since it is larger than the sum of its proper divisors (32832403).

161729197 is a wasteful number, since it uses less digits than its factorization.

161729197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216035.

The product of its digits is 47628, while the sum is 43.

The square root of 161729197 is about 12717.2794653574. The cubic root of 161729197 is about 544.8322542974.

The spelling of 161729197 in words is "one hundred sixty-one million, seven hundred twenty-nine thousand, one hundred ninety-seven".