161729117 has 8 divisors (see below), whose sum is σ = 179324832. Its totient is φ = 144615600.

The previous prime is 161729107. The next prime is 161729131. The reversal of 161729117 is 711927161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161729117 is a prime.

It is a super-3 number, since 3×161729117³ (a number of 26 digits) contains 333 as substring.

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, 119843 + ... + 121184.

It is an arithmetic number, because the mean of its divisors is an integer number (22415604).

Almost surely, 2^161729117 is an apocalyptic number.

It is an amenable number.

161729117 is a deficient number, since it is larger than the sum of its proper divisors (17595715).

161729117 is a wasteful number, since it uses less digits than its factorization.

161729117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241099.

The product of its digits is 5292, while the sum is 35.

The square root of 161729117 is about 12717.2763200302. The cubic root of 161729117 is about 544.8321644629.

The spelling of 161729117 in words is "one hundred sixty-one million, seven hundred twenty-nine thousand, one hundred seventeen".