16722081 has 12 divisors (see below), whose sum is σ = 25204608. Its totient is φ = 10663224.

The previous prime is 16722077. The next prime is 16722089. The reversal of 16722081 is 18022761.

It is not a de Polignac number, because 16722081 - 2² = 16722077 is a prime.

It is a super-2 number, since 2×16722081² = 559255985941122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16722089) 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 in 11 ways as a sum of consecutive naturals, for example, 40185 + ... + 40598.

It is an arithmetic number, because the mean of its divisors is an integer number (2100384).

Almost surely, 2^16722081 is an apocalyptic number.

It is an amenable number.

16722081 is a deficient number, since it is larger than the sum of its proper divisors (8482527).

16722081 is a wasteful number, since it uses less digits than its factorization.

16722081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80812 (or 80809 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 16722081 is about 4089.2641147277. The cubic root of 16722081 is about 255.7192611325.

The spelling of 16722081 in words is "sixteen million, seven hundred twenty-two thousand, eighty-one".