82801111 has 2 divisors, whose sum is σ = 82801112. Its totient is φ = 82801110.

The previous prime is 82801109. The next prime is 82801129. The reversal of 82801111 is 11110828.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82801111 - 2¹ = 82801109 is a prime.

Together with 82801109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82801141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41400555 + 41400556.

It is an arithmetic number, because the mean of its divisors is an integer number (41400556).

Almost surely, 2^82801111 is an apocalyptic number.

82801111 is a deficient number, since it is larger than the sum of its proper divisors (1).

82801111 is an equidigital number, since it uses as much as digits as its factorization.

82801111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 82801111 is about 9099.5115802992. The cubic root of 82801111 is about 435.8583676401.

Adding to 82801111 its reverse (11110828), we get a palindrome (93911939).

The spelling of 82801111 in words is "eighty-two million, eight hundred one thousand, one hundred eleven".