16631222 has 4 divisors (see below), whose sum is σ = 24946836. Its totient is φ = 8315610.

The previous prime is 16631203. The next prime is 16631233. The reversal of 16631222 is 22213661.

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

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, 4157804 + ... + 4157807.

It is an arithmetic number, because the mean of its divisors is an integer number (6236709).

Almost surely, 2^16631222 is an apocalyptic number.

16631222 is a deficient number, since it is larger than the sum of its proper divisors (8315614).

16631222 is an equidigital number, since it uses as much as digits as its factorization.

16631222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8315613.

The product of its digits is 864, while the sum is 23.

The square root of 16631222 is about 4078.1395267941. The cubic root of 16631222 is about 255.2552717322.

Adding to 16631222 its reverse (22213661), we get a palindrome (38844883).

The spelling of 16631222 in words is "sixteen million, six hundred thirty-one thousand, two hundred twenty-two".