22188557 has 2 divisors, whose sum is σ = 22188558. Its totient is φ = 22188556.

The previous prime is 22188511. The next prime is 22188563. The reversal of 22188557 is 75588122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17255716 + 4932841 = 4154^2 + 2221^2 .

It is a cyclic number.

It is not a de Polignac number, because 22188557 - 2¹⁴ = 22172173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22188557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22188577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11094278 + 11094279.

It is an arithmetic number, because the mean of its divisors is an integer number (11094279).

Almost surely, 2^22188557 is an apocalyptic number.

It is an amenable number.

22188557 is a deficient number, since it is larger than the sum of its proper divisors (1).

22188557 is an equidigital number, since it uses as much as digits as its factorization.

22188557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44800, while the sum is 38.

The square root of 22188557 is about 4710.4731184882. The cubic root of 22188557 is about 281.0021782737.

The spelling of 22188557 in words is "twenty-two million, one hundred eighty-eight thousand, five hundred fifty-seven".