111685811 has 2 divisors, whose sum is σ = 111685812. Its totient is φ = 111685810.

The previous prime is 111685799. The next prime is 111685813. The reversal of 111685811 is 118586111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111685811 - 2⁶ = 111685747 is a prime.

It is a Sophie Germain prime.

Together with 111685813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111685813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55842905 + 55842906.

It is an arithmetic number, because the mean of its divisors is an integer number (55842906).

Almost surely, 2^111685811 is an apocalyptic number.

111685811 is a deficient number, since it is larger than the sum of its proper divisors (1).

111685811 is an equidigital number, since it uses as much as digits as its factorization.

111685811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 32.

The square root of 111685811 is about 10568.1507843142. The cubic root of 111685811 is about 481.5772924908.

The spelling of 111685811 in words is "one hundred eleven million, six hundred eighty-five thousand, eight hundred eleven".