111809983 has 2 divisors, whose sum is σ = 111809984. Its totient is φ = 111809982.

The previous prime is 111809981. The next prime is 111809987. The reversal of 111809983 is 389908111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111809983 - 2¹ = 111809981 is a prime.

Together with 111809981, 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 (111809981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55904991 + 55904992.

It is an arithmetic number, because the mean of its divisors is an integer number (55904992).

Almost surely, 2^111809983 is an apocalyptic number.

111809983 is a deficient number, since it is larger than the sum of its proper divisors (1).

111809983 is an equidigital number, since it uses as much as digits as its factorization.

111809983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 111809983 is about 10574.0239738711. The cubic root of 111809983 is about 481.7556985254.

The spelling of 111809983 in words is "one hundred eleven million, eight hundred nine thousand, nine hundred eighty-three".