111809741 has 2 divisors, whose sum is σ = 111809742. Its totient is φ = 111809740.

The previous prime is 111809729. The next prime is 111809743. The reversal of 111809741 is 147908111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75255625 + 36554116 = 8675^2 + 6046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111809741 is a prime.

Together with 111809743, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 111809698 and 111809707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111809743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55904870 + 55904871.

It is an arithmetic number, because the mean of its divisors is an integer number (55904871).

Almost surely, 2^111809741 is an apocalyptic number.

It is an amenable number.

111809741 is a deficient number, since it is larger than the sum of its proper divisors (1).

111809741 is an equidigital number, since it uses as much as digits as its factorization.

111809741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 32.

The square root of 111809741 is about 10574.0125307283. The cubic root of 111809741 is about 481.7553509567.

The spelling of 111809741 in words is "one hundred eleven million, eight hundred nine thousand, seven hundred forty-one".