22591993 has 2 divisors, whose sum is σ = 22591994. Its totient is φ = 22591992.

The previous prime is 22591951. The next prime is 22591999. The reversal of 22591993 is 39919522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21086464 + 1505529 = 4592^2 + 1227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22591993 is a prime.

It is not a weakly prime, because it can be changed into another prime (22591999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11295996 + 11295997.

It is an arithmetic number, because the mean of its divisors is an integer number (11295997).

Almost surely, 2^22591993 is an apocalyptic number.

It is an amenable number.

22591993 is a deficient number, since it is larger than the sum of its proper divisors (1).

22591993 is an equidigital number, since it uses as much as digits as its factorization.

22591993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 40.

The square root of 22591993 is about 4753.1035124432. The cubic root of 22591993 is about 282.6950353917.

The spelling of 22591993 in words is "twenty-two million, five hundred ninety-one thousand, nine hundred ninety-three".