22961209 has 2 divisors, whose sum is σ = 22961210. Its totient is φ = 22961208.

The previous prime is 22961171. The next prime is 22961221. The reversal of 22961209 is 90216922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22771984 + 189225 = 4772^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 22961209 - 2¹¹ = 22959161 is a prime.

It is not a weakly prime, because it can be changed into another prime (22961249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11480604 + 11480605.

It is an arithmetic number, because the mean of its divisors is an integer number (11480605).

Almost surely, 2^22961209 is an apocalyptic number.

It is an amenable number.

22961209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22961209 is an equidigital number, since it uses as much as digits as its factorization.

22961209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 22961209 is about 4791.7855753362. The cubic root of 22961209 is about 284.2267291144.

The spelling of 22961209 in words is "twenty-two million, nine hundred sixty-one thousand, two hundred nine".