28200191111 has 2 divisors, whose sum is σ = 28200191112. Its totient is φ = 28200191110.

The previous prime is 28200191029. The next prime is 28200191177. The reversal of 28200191111 is 11119100282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28200191111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28200190111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14100095555 + 14100095556.

It is an arithmetic number, because the mean of its divisors is an integer number (14100095556).

Almost surely, 2^28200191111 is an apocalyptic number.

28200191111 is a deficient number, since it is larger than the sum of its proper divisors (1).

28200191111 is an equidigital number, since it uses as much as digits as its factorization.

28200191111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 26.

Adding to 28200191111 its reverse (11119100282), we get a palindrome (39319291393).

The spelling of 28200191111 in words is "twenty-eight billion, two hundred million, one hundred ninety-one thousand, one hundred eleven".