111447839 has 2 divisors, whose sum is σ = 111447840. Its totient is φ = 111447838.

The previous prime is 111447823. The next prime is 111447893. The reversal of 111447839 is 938744111.

Together with next prime (111447893) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111447839 - 2⁴ = 111447823 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111447439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55723919 + 55723920.

It is an arithmetic number, because the mean of its divisors is an integer number (55723920).

Almost surely, 2^111447839 is an apocalyptic number.

111447839 is a deficient number, since it is larger than the sum of its proper divisors (1).

111447839 is an equidigital number, since it uses as much as digits as its factorization.

111447839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 111447839 is about 10556.8858571077. The cubic root of 111447839 is about 481.2350126552.

The spelling of 111447839 in words is "one hundred eleven million, four hundred forty-seven thousand, eight hundred thirty-nine".