116565989 has 2 divisors, whose sum is σ = 116565990. Its totient is φ = 116565988.

The previous prime is 116565973. The next prime is 116566031. The reversal of 116565989 is 989565611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64480900 + 52085089 = 8030^2 + 7217^2 .

It is an emirp because it is prime and its reverse (989565611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 116565989 - 2⁴ = 116565973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116565089) 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, 58282994 + 58282995.

It is an arithmetic number, because the mean of its divisors is an integer number (58282995).

Almost surely, 2^116565989 is an apocalyptic number.

It is an amenable number.

116565989 is a deficient number, since it is larger than the sum of its proper divisors (1).

116565989 is an equidigital number, since it uses as much as digits as its factorization.

116565989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 50.

The square root of 116565989 is about 10796.5730211026. The cubic root of 116565989 is about 488.4918071658.

The spelling of 116565989 in words is "one hundred sixteen million, five hundred sixty-five thousand, nine hundred eighty-nine".