111311987 has 2 divisors, whose sum is σ = 111311988. Its totient is φ = 111311986.

The previous prime is 111311969. The next prime is 111312023. The reversal of 111311987 is 789113111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111311987 - 2¹⁰ = 111310963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111311957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55655993 + 55655994.

It is an arithmetic number, because the mean of its divisors is an integer number (55655994).

Almost surely, 2^111311987 is an apocalyptic number.

111311987 is a deficient number, since it is larger than the sum of its proper divisors (1).

111311987 is an equidigital number, since it uses as much as digits as its factorization.

111311987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 32.

The square root of 111311987 is about 10550.4496112725. The cubic root of 111311987 is about 481.0393955195.

The spelling of 111311987 in words is "one hundred eleven million, three hundred eleven thousand, nine hundred eighty-seven".