22597997 has 2 divisors, whose sum is σ = 22597998. Its totient is φ = 22597996.

The previous prime is 22597987. The next prime is 22598021. The reversal of 22597997 is 79979522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22458121 + 139876 = 4739^2 + 374^2 .

It is a cyclic number.

It is not a de Polignac number, because 22597997 - 2⁶ = 22597933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22597907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11298998 + 11298999.

It is an arithmetic number, because the mean of its divisors is an integer number (11298999).

Almost surely, 2^22597997 is an apocalyptic number.

It is an amenable number.

22597997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22597997 is an equidigital number, since it uses as much as digits as its factorization.

22597997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 50.

The square root of 22597997 is about 4753.7350578256. The cubic root of 22597997 is about 282.7200759840.

The spelling of 22597997 in words is "twenty-two million, five hundred ninety-seven thousand, nine hundred ninety-seven".