22156009 has 2 divisors, whose sum is σ = 22156010. Its totient is φ = 22156008.

The previous prime is 22156003. The next prime is 22156019. The reversal of 22156009 is 90065122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19333609 + 2822400 = 4397^2 + 1680^2 .

It is a cyclic number.

It is not a de Polignac number, because 22156009 - 2⁵ = 22155977 is a prime.

It is not a weakly prime, because it can be changed into another prime (22156003) 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, 11078004 + 11078005.

It is an arithmetic number, because the mean of its divisors is an integer number (11078005).

Almost surely, 2^22156009 is an apocalyptic number.

It is an amenable number.

22156009 is a deficient number, since it is larger than the sum of its proper divisors (1).

22156009 is an equidigital number, since it uses as much as digits as its factorization.

22156009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 22156009 is about 4707.0169959328. The cubic root of 22156009 is about 280.8647120020.

The spelling of 22156009 in words is "twenty-two million, one hundred fifty-six thousand, nine".