161193923 has 8 divisors (see below), whose sum is σ = 176230080. Its totient is φ = 146221480.

The previous prime is 161193917. The next prime is 161193947. The reversal of 161193923 is 329391161.

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 161193923 - 2⁸ = 161193667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161193953) 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, 10553 + ... + 20826.

It is an arithmetic number, because the mean of its divisors is an integer number (22028760).

Almost surely, 2^161193923 is an apocalyptic number.

161193923 is a deficient number, since it is larger than the sum of its proper divisors (15036157).

161193923 is a wasteful number, since it uses less digits than its factorization.

161193923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31857.

The product of its digits is 8748, while the sum is 35.

The square root of 161193923 is about 12696.2168774797. The cubic root of 161193923 is about 544.2305141073.

The spelling of 161193923 in words is "one hundred sixty-one million, one hundred ninety-three thousand, nine hundred twenty-three".