161269222 has 4 divisors (see below), whose sum is σ = 241903836. Its totient is φ = 80634610.

The previous prime is 161269219. The next prime is 161269231. The reversal of 161269222 is 222962161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222962161 = 23 ⋅9694007.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40317304 + ... + 40317307.

It is an arithmetic number, because the mean of its divisors is an integer number (60475959).

Almost surely, 2^161269222 is an apocalyptic number.

161269222 is a deficient number, since it is larger than the sum of its proper divisors (80634614).

161269222 is an equidigital number, since it uses as much as digits as its factorization.

161269222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80634613.

The product of its digits is 5184, while the sum is 31.

The square root of 161269222 is about 12699.1819421567. The cubic root of 161269222 is about 544.3152435920.

The spelling of 161269222 in words is "one hundred sixty-one million, two hundred sixty-nine thousand, two hundred twenty-two".