161795905 has 8 divisors (see below), whose sum is σ = 194291712. Its totient is φ = 129345648.

The previous prime is 161795867. The next prime is 161795917. The reversal of 161795905 is 509597161.

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 161795905 - 2²¹ = 159698753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3009 + ... + 18238.

It is an arithmetic number, because the mean of its divisors is an integer number (24286464).

Almost surely, 2^161795905 is an apocalyptic number.

It is an amenable number.

161795905 is a deficient number, since it is larger than the sum of its proper divisors (32495807).

161795905 is a wasteful number, since it uses less digits than its factorization.

161795905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22775.

The product of its (nonzero) digits is 85050, while the sum is 43.

The square root of 161795905 is about 12719.9019257225. The cubic root of 161795905 is about 544.9071524911.

The spelling of 161795905 in words is "one hundred sixty-one million, seven hundred ninety-five thousand, nine hundred five".