161838223 has 4 divisors (see below), whose sum is σ = 163656720. Its totient is φ = 160019728.

The previous prime is 161838217. The next prime is 161838227. The reversal of 161838223 is 322838161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322838161 = 79 ⋅4086559.

It is a cyclic number.

It is not a de Polignac number, because 161838223 - 2⁵ = 161838191 is a prime.

It is a super-2 number, since 2×161838223² = 52383220847595458, which contains 22 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 (161838227) 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, 909115 + ... + 909292.

It is an arithmetic number, because the mean of its divisors is an integer number (40914180).

Almost surely, 2^161838223 is an apocalyptic number.

161838223 is a deficient number, since it is larger than the sum of its proper divisors (1818497).

161838223 is an equidigital number, since it uses as much as digits as its factorization.

161838223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818496.

The product of its digits is 13824, while the sum is 34.

The square root of 161838223 is about 12721.5652731887. The cubic root of 161838223 is about 544.9546554873.

The spelling of 161838223 in words is "one hundred sixty-one million, eight hundred thirty-eight thousand, two hundred twenty-three".