22162009 has 2 divisors, whose sum is σ = 22162010. Its totient is φ = 22162008.

The previous prime is 22161991. The next prime is 22162043. The reversal of 22162009 is 90026122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14478025 + 7683984 = 3805^2 + 2772^2 .

It is a cyclic number.

It is not a de Polignac number, because 22162009 - 2⁵ = 22161977 is a prime.

It is not a weakly prime, because it can be changed into another prime (22165009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11081004 + 11081005.

It is an arithmetic number, because the mean of its divisors is an integer number (11081005).

Almost surely, 2^22162009 is an apocalyptic number.

It is an amenable number.

22162009 is a deficient number, since it is larger than the sum of its proper divisors (1).

22162009 is an equidigital number, since it uses as much as digits as its factorization.

22162009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 22162009 is about 4707.6542991176. The cubic root of 22162009 is about 280.8900630806.

It can be divided in two parts, 2216 and 2009, that added together give a square (4225 = 65²).

The spelling of 22162009 in words is "twenty-two million, one hundred sixty-two thousand, nine".