102805111 has 2 divisors, whose sum is σ = 102805112. Its totient is φ = 102805110.

The previous prime is 102805099. The next prime is 102805123. The reversal of 102805111 is 111508201.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (102805099) and next prime (102805123).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102805111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102805411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51402555 + 51402556.

It is an arithmetic number, because the mean of its divisors is an integer number (51402556).

Almost surely, 2^102805111 is an apocalyptic number.

102805111 is a deficient number, since it is larger than the sum of its proper divisors (1).

102805111 is an equidigital number, since it uses as much as digits as its factorization.

102805111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 102805111 is about 10139.2855270971. The cubic root of 102805111 is about 468.4589803439.

The spelling of 102805111 in words is "one hundred two million, eight hundred five thousand, one hundred eleven".