161838173 has 4 divisors (see below), whose sum is σ = 184957920. Its totient is φ = 138718428.

The previous prime is 161838167. The next prime is 161838179. The reversal of 161838173 is 371838161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (161838167) and next prime (161838179).

It is a cyclic number.

It is not a de Polignac number, because 161838173 - 2²⁰ = 160789597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161838179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11559863 + ... + 11559876.

It is an arithmetic number, because the mean of its divisors is an integer number (46239480).

Almost surely, 2^161838173 is an apocalyptic number.

It is an amenable number.

161838173 is a deficient number, since it is larger than the sum of its proper divisors (23119747).

161838173 is an equidigital number, since it uses as much as digits as its factorization.

161838173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23119746.

The product of its digits is 24192, while the sum is 38.

The square root of 161838173 is about 12721.5633080215. The cubic root of 161838173 is about 544.9545993659.

The spelling of 161838173 in words is "one hundred sixty-one million, eight hundred thirty-eight thousand, one hundred seventy-three".