22249891 has 2 divisors, whose sum is σ = 22249892. Its totient is φ = 22249890.

The previous prime is 22249853. The next prime is 22249907. The reversal of 22249891 is 19894222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22249891 - 2²¹ = 20152739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22249891.

It is not a weakly prime, because it can be changed into another prime (22249841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11124945 + 11124946.

It is an arithmetic number, because the mean of its divisors is an integer number (11124946).

Almost surely, 2^22249891 is an apocalyptic number.

22249891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22249891 is an equidigital number, since it uses as much as digits as its factorization.

22249891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 22249891 is about 4716.9790120373. The cubic root of 22249891 is about 281.2608571282.

The spelling of 22249891 in words is "twenty-two million, two hundred forty-nine thousand, eight hundred ninety-one".