22247891 has 2 divisors, whose sum is σ = 22247892. Its totient is φ = 22247890.

The previous prime is 22247867. The next prime is 22247909. The reversal of 22247891 is 19874222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22247891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22247821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11123945 + 11123946.

It is an arithmetic number, because the mean of its divisors is an integer number (11123946).

Almost surely, 2^22247891 is an apocalyptic number.

22247891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22247891 is an equidigital number, since it uses as much as digits as its factorization.

22247891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 22247891 is about 4716.7670071777. The cubic root of 22247891 is about 281.2524295428.

The spelling of 22247891 in words is "twenty-two million, two hundred forty-seven thousand, eight hundred ninety-one".