9915559 has 2 divisors, whose sum is σ = 9915560. Its totient is φ = 9915558.

The previous prime is 9915547. The next prime is 9915589. The reversal of 9915559 is 9555199.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9915559 - 2¹¹ = 9913511 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9915509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4957779 + 4957780.

It is an arithmetic number, because the mean of its divisors is an integer number (4957780).

Almost surely, 2^9915559 is an apocalyptic number.

9915559 is a deficient number, since it is larger than the sum of its proper divisors (1).

9915559 is an equidigital number, since it uses as much as digits as its factorization.

9915559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91125, while the sum is 43.

The square root of 9915559 is about 3148.8980612271. The cubic root of 9915559 is about 214.8353453598.

The spelling of 9915559 in words is "nine million, nine hundred fifteen thousand, five hundred fifty-nine".