22191797 has 2 divisors, whose sum is σ = 22191798. Its totient is φ = 22191796.

The previous prime is 22191779. The next prime is 22191809. The reversal of 22191797 is 79719122.

Together with previous prime (22191779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 6895876 = 3911^2 + 2626^2 .

It is a cyclic number.

It is not a de Polignac number, because 22191797 - 2⁶ = 22191733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22191797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22191707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11095898 + 11095899.

It is an arithmetic number, because the mean of its divisors is an integer number (11095899).

Almost surely, 2^22191797 is an apocalyptic number.

It is an amenable number.

22191797 is a deficient number, since it is larger than the sum of its proper divisors (1).

22191797 is an equidigital number, since it uses as much as digits as its factorization.

22191797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 38.

The square root of 22191797 is about 4710.8170204329. The cubic root of 22191797 is about 281.0158550343.

The spelling of 22191797 in words is "twenty-two million, one hundred ninety-one thousand, seven hundred ninety-seven".