161500222 has 32 divisors (see below), whose sum is σ = 267478848. Its totient is φ = 72673536.

The previous prime is 161500193. The next prime is 161500223. The reversal of 161500222 is 222005161.

It is a self number, because there is not a number n which added to its sum of digits gives 161500222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161500223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320823 + ... + 321325.

It is an arithmetic number, because the mean of its divisors is an integer number (8358714).

Almost surely, 2^161500222 is an apocalyptic number.

161500222 is a deficient number, since it is larger than the sum of its proper divisors (105978626).

161500222 is a wasteful number, since it uses less digits than its factorization.

161500222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 161500222 is about 12708.2737616090. The cubic root of 161500222 is about 544.5750096999.

Adding to 161500222 its reverse (222005161), we get a palindrome (383505383).

The spelling of 161500222 in words is "one hundred sixty-one million, five hundred thousand, two hundred twenty-two".