22781009 has 2 divisors, whose sum is σ = 22781010. Its totient is φ = 22781008.

The previous prime is 22780997. The next prime is 22781029. The reversal of 22781009 is 90018722.

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., 22771984 + 9025 = 4772^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 22781009 - 2²⁴ = 6003793 is a prime.

It is not a weakly prime, because it can be changed into another prime (22781029) 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 as a sum of consecutive naturals, namely, 11390504 + 11390505.

It is an arithmetic number, because the mean of its divisors is an integer number (11390505).

Almost surely, 2^22781009 is an apocalyptic number.

It is an amenable number.

22781009 is a deficient number, since it is larger than the sum of its proper divisors (1).

22781009 is an equidigital number, since it uses as much as digits as its factorization.

22781009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 22781009 is about 4772.9455266114. The cubic root of 22781009 is about 283.4812365818.

The spelling of 22781009 in words is "twenty-two million, seven hundred eighty-one thousand, nine".