115563989 has 2 divisors, whose sum is σ = 115563990. Its totient is φ = 115563988.

The previous prime is 115563907. The next prime is 115564027. The reversal of 115563989 is 989365511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76912900 + 38651089 = 8770^2 + 6217^2 .

It is a cyclic number.

It is not a de Polignac number, because 115563989 - 2⁸ = 115563733 is a 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 (115563689) 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, 57781994 + 57781995.

It is an arithmetic number, because the mean of its divisors is an integer number (57781995).

Almost surely, 2^115563989 is an apocalyptic number.

It is an amenable number.

115563989 is a deficient number, since it is larger than the sum of its proper divisors (1).

115563989 is an equidigital number, since it uses as much as digits as its factorization.

115563989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 47.

The square root of 115563989 is about 10750.0692555909. The cubic root of 115563989 is about 487.0880872049.

The spelling of 115563989 in words is "one hundred fifteen million, five hundred sixty-three thousand, nine hundred eighty-nine".