28939111 has 2 divisors, whose sum is σ = 28939112. Its totient is φ = 28939110.

The previous prime is 28939093. The next prime is 28939121. The reversal of 28939111 is 11193982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28939111 - 2⁹ = 28938599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28939121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14469555 + 14469556.

It is an arithmetic number, because the mean of its divisors is an integer number (14469556).

Almost surely, 2^28939111 is an apocalyptic number.

28939111 is a deficient number, since it is larger than the sum of its proper divisors (1).

28939111 is an equidigital number, since it uses as much as digits as its factorization.

28939111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 34.

The square root of 28939111 is about 5379.5084347922. The cubic root of 28939111 is about 307.0165085712.

The spelling of 28939111 in words is "twenty-eight million, nine hundred thirty-nine thousand, one hundred eleven".