16822081 has 4 divisors (see below), whose sum is σ = 16864852. Its totient is φ = 16779312.

The previous prime is 16822037. The next prime is 16822097. The reversal of 16822081 is 18022861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18022861 = 1171 ⋅15391.

It can be written as a sum of positive squares in 2 ways, for example, as 5363856 + 11458225 = 2316^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 16822081 - 2⁷ = 16821953 is a prime.

It is a super-2 number, since 2×16822081² = 565964818341122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16820081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20790 + ... + 21583.

It is an arithmetic number, because the mean of its divisors is an integer number (4216213).

It is a Poulet number, since it divides 2^16822080-1.

Almost surely, 2^16822081 is an apocalyptic number.

It is an amenable number.

16822081 is a deficient number, since it is larger than the sum of its proper divisors (42771).

16822081 is an equidigital number, since it uses as much as digits as its factorization.

16822081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42770.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 16822081 is about 4101.4730280717. The cubic root of 16822081 is about 256.2279920818.

It can be divided in two parts, 1682208 and 1, that added together give a square (1682209 = 1297²).

The spelling of 16822081 in words is "sixteen million, eight hundred twenty-two thousand, eighty-one".