161569222 has 4 divisors (see below), whose sum is σ = 242353836. Its totient is φ = 80784610.

The previous prime is 161569157. The next prime is 161569223. The reversal of 161569222 is 222965161.

It is a happy number.

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

It is a super-2 number, since 2×161569222² = 52209226995370568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161569223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40392304 + ... + 40392307.

It is an arithmetic number, because the mean of its divisors is an integer number (60588459).

Almost surely, 2^161569222 is an apocalyptic number.

161569222 is a deficient number, since it is larger than the sum of its proper divisors (80784614).

161569222 is an equidigital number, since it uses as much as digits as its factorization.

161569222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80784613.

The product of its digits is 12960, while the sum is 34.

The square root of 161569222 is about 12710.9882385281. The cubic root of 161569222 is about 544.6525541250.

The spelling of 161569222 in words is "one hundred sixty-one million, five hundred sixty-nine thousand, two hundred twenty-two".