28224191 has 2 divisors, whose sum is σ = 28224192. Its totient is φ = 28224190.

The previous prime is 28224173. The next prime is 28224223. The reversal of 28224191 is 19142282.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28224191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28224121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14112095 + 14112096.

It is an arithmetic number, because the mean of its divisors is an integer number (14112096).

Almost surely, 2^28224191 is an apocalyptic number.

28224191 is a deficient number, since it is larger than the sum of its proper divisors (1).

28224191 is an equidigital number, since it uses as much as digits as its factorization.

28224191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 28224191 is about 5312.6444450951. The cubic root of 28224191 is about 304.4671912437.

The spelling of 28224191 in words is "twenty-eight million, two hundred twenty-four thousand, one hundred ninety-one".