22909891 has 2 divisors, whose sum is σ = 22909892. Its totient is φ = 22909890.

The previous prime is 22909889. The next prime is 22909949. The reversal of 22909891 is 19890922.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22909891 - 2¹ = 22909889 is a prime.

Together with 22909889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22909811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11454945 + 11454946.

It is an arithmetic number, because the mean of its divisors is an integer number (11454946).

Almost surely, 2^22909891 is an apocalyptic number.

22909891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22909891 is an equidigital number, since it uses as much as digits as its factorization.

22909891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 22909891 is about 4786.4277911612. The cubic root of 22909891 is about 284.0148235006.

The spelling of 22909891 in words is "twenty-two million, nine hundred nine thousand, eight hundred ninety-one".