111647989 has 2 divisors, whose sum is σ = 111647990. Its totient is φ = 111647988.

The previous prime is 111647951. The next prime is 111648023. The reversal of 111647989 is 989746111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94284100 + 17363889 = 9710^2 + 4167^2 .

It is a cyclic number.

It is not a de Polignac number, because 111647989 - 2¹³ = 111639797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111647689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55823994 + 55823995.

It is an arithmetic number, because the mean of its divisors is an integer number (55823995).

Almost surely, 2^111647989 is an apocalyptic number.

It is an amenable number.

111647989 is a deficient number, since it is larger than the sum of its proper divisors (1).

111647989 is an equidigital number, since it uses as much as digits as its factorization.

111647989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 111647989 is about 10566.3611995805. The cubic root of 111647989 is about 481.5229248779.

The spelling of 111647989 in words is "one hundred eleven million, six hundred forty-seven thousand, nine hundred eighty-nine".