28111103 has 2 divisors, whose sum is σ = 28111104. Its totient is φ = 28111102.

The previous prime is 28111093. The next prime is 28111133. The reversal of 28111103 is 30111182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28111103 - 2¹⁰ = 28110079 is a prime.

It is a super-2 number, since 2×28111103² = 1580468223753218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28111133) 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, 14055551 + 14055552.

It is an arithmetic number, because the mean of its divisors is an integer number (14055552).

Almost surely, 2^28111103 is an apocalyptic number.

28111103 is a deficient number, since it is larger than the sum of its proper divisors (1).

28111103 is an equidigital number, since it uses as much as digits as its factorization.

28111103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 28111103 is about 5301.9904752838. The cubic root of 28111103 is about 304.0600030163.

Adding to 28111103 its reverse (30111182), we get a palindrome (58222285).

The spelling of 28111103 in words is "twenty-eight million, one hundred eleven thousand, one hundred three".