28223191 has 2 divisors, whose sum is σ = 28223192. Its totient is φ = 28223190.

The previous prime is 28223183. The next prime is 28223197. The reversal of 28223191 is 19132282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28223191 - 2³ = 28223183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28223197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111595 + 14111596.

It is an arithmetic number, because the mean of its divisors is an integer number (14111596).

Almost surely, 2^28223191 is an apocalyptic number.

28223191 is a deficient number, since it is larger than the sum of its proper divisors (1).

28223191 is an equidigital number, since it uses as much as digits as its factorization.

28223191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 28223191 is about 5312.5503291734. The cubic root of 28223191 is about 304.4635953829.

Subtracting from 28223191 its reverse (19132282), we obtain a palindrome (9090909).

The spelling of 28223191 in words is "twenty-eight million, two hundred twenty-three thousand, one hundred ninety-one".