161442223 has 4 divisors (see below), whose sum is σ = 161490888. Its totient is φ = 161393560.

The previous prime is 161442191. The next prime is 161442247. The reversal of 161442223 is 322244161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161442223 - 2⁵ = 161442191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161442923) 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, 18961 + ... + 26122.

It is an arithmetic number, because the mean of its divisors is an integer number (40372722).

Almost surely, 2^161442223 is an apocalyptic number.

161442223 is a deficient number, since it is larger than the sum of its proper divisors (48665).

161442223 is an equidigital number, since it uses as much as digits as its factorization.

161442223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48664.

The product of its digits is 2304, while the sum is 25.

The square root of 161442223 is about 12705.9916181304. The cubic root of 161442223 is about 544.5098114661.

Adding to 161442223 its reverse (322244161), we get a palindrome (483686384).

The spelling of 161442223 in words is "one hundred sixty-one million, four hundred forty-two thousand, two hundred twenty-three".