28103111 has 2 divisors, whose sum is σ = 28103112. Its totient is φ = 28103110.

The previous prime is 28103077. The next prime is 28103177. The reversal of 28103111 is 11130182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28103111 - 2¹⁴ = 28086727 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28103111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28103191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14051555 + 14051556.

It is an arithmetic number, because the mean of its divisors is an integer number (14051556).

Almost surely, 2^28103111 is an apocalyptic number.

28103111 is a deficient number, since it is larger than the sum of its proper divisors (1).

28103111 is an equidigital number, since it uses as much as digits as its factorization.

28103111 is an evil number, because the sum of its binary digits is even.

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

The square root of 28103111 is about 5301.2367424970. The cubic root of 28103111 is about 304.0311854838.

Adding to 28103111 its reverse (11130182), we get a palindrome (39233293).

It can be divided in two parts, 281031 and 11, that multiplied together give a triangular number (3091341 = T₂₄₈₆).

The spelling of 28103111 in words is "twenty-eight million, one hundred three thousand, one hundred eleven".