22009081 has 2 divisors, whose sum is σ = 22009082. Its totient is φ = 22009080.

The previous prime is 22009073. The next prime is 22009109. The reversal of 22009081 is 18090022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22005481 + 3600 = 4691^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 22009081 - 2³ = 22009073 is a prime.

It is a super-2 number, since 2×22009081² = 968799292929122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22009021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11004540 + 11004541.

It is an arithmetic number, because the mean of its divisors is an integer number (11004541).

Almost surely, 2^22009081 is an apocalyptic number.

It is an amenable number.

22009081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22009081 is an equidigital number, since it uses as much as digits as its factorization.

22009081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 22009081 is about 4691.3836978017. The cubic root of 22009081 is about 280.2424812760.

The spelling of 22009081 in words is "twenty-two million, nine thousand, eighty-one".