22139891 has 2 divisors, whose sum is σ = 22139892. Its totient is φ = 22139890.

The previous prime is 22139881. The next prime is 22139911. The reversal of 22139891 is 19893122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22139891 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22139861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11069945 + 11069946.

It is an arithmetic number, because the mean of its divisors is an integer number (11069946).

Almost surely, 2^22139891 is an apocalyptic number.

22139891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22139891 is an equidigital number, since it uses as much as digits as its factorization.

22139891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 22139891 is about 4705.3045597496. The cubic root of 22139891 is about 280.7965878853.

The spelling of 22139891 in words is "twenty-two million, one hundred thirty-nine thousand, eight hundred ninety-one".