80111111 has 2 divisors, whose sum is σ = 80111112. Its totient is φ = 80111110.

The previous prime is 80111071. The next prime is 80111113. The reversal of 80111111 is 11111108.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80111111 is a prime.

Together with 80111113, it forms a pair of twin primes.

It is a Chen prime.

80111111 is a modest number, since divided by 11111 gives 801 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80111113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40055555 + 40055556.

It is an arithmetic number, because the mean of its divisors is an integer number (40055556).

Almost surely, 2^80111111 is an apocalyptic number.

80111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

80111111 is an equidigital number, since it uses as much as digits as its factorization.

80111111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 14.

The square root of 80111111 is about 8950.4810485247. The cubic root of 80111111 is about 431.0863302178.

Adding to 80111111 its reverse (11111108), we get a palindrome (91222219).

The spelling of 80111111 in words is "eighty million, one hundred eleven thousand, one hundred eleven".