161028223 has 4 divisors (see below), whose sum is σ = 161467360. Its totient is φ = 160589088.

The previous prime is 161028209. The next prime is 161028289. The reversal of 161028223 is 322820161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322820161 = 1993 ⋅161977.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161028223 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 (161038223) 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, 219018 + ... + 219751.

It is an arithmetic number, because the mean of its divisors is an integer number (40366840).

Almost surely, 2^161028223 is an apocalyptic number.

161028223 is a deficient number, since it is larger than the sum of its proper divisors (439137).

161028223 is an equidigital number, since it uses as much as digits as its factorization.

161028223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439136.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 161028223 is about 12689.6896337145. The cubic root of 161028223 is about 544.0439687915.

Adding to 161028223 its reverse (322820161), we get a palindrome (483848384).

The spelling of 161028223 in words is "one hundred sixty-one million, twenty-eight thousand, two hundred twenty-three".