22198987 has 2 divisors, whose sum is σ = 22198988. Its totient is φ = 22198986.

The previous prime is 22198961. The next prime is 22199029. The reversal of 22198987 is 78989122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22198987 - 2¹⁹ = 21674699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22198907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11099493 + 11099494.

It is an arithmetic number, because the mean of its divisors is an integer number (11099494).

Almost surely, 2^22198987 is an apocalyptic number.

22198987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22198987 is an equidigital number, since it uses as much as digits as its factorization.

22198987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 46.

The square root of 22198987 is about 4711.5800958914. The cubic root of 22198987 is about 281.0462008692.

The spelling of 22198987 in words is "twenty-two million, one hundred ninety-eight thousand, nine hundred eighty-seven".