22188251 has 2 divisors, whose sum is σ = 22188252. Its totient is φ = 22188250.

The previous prime is 22188241. The next prime is 22188253. The reversal of 22188251 is 15288122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22188251 - 2¹⁴ = 22171867 is a prime.

It is a Sophie Germain prime.

Together with 22188253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22188253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11094125 + 11094126.

It is an arithmetic number, because the mean of its divisors is an integer number (11094126).

Almost surely, 2^22188251 is an apocalyptic number.

22188251 is a deficient number, since it is larger than the sum of its proper divisors (1).

22188251 is an equidigital number, since it uses as much as digits as its factorization.

22188251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 29.

The square root of 22188251 is about 4710.4406375625. The cubic root of 22188251 is about 281.0008865108. Note that the first 3 decimals are identical.

The spelling of 22188251 in words is "twenty-two million, one hundred eighty-eight thousand, two hundred fifty-one".