99915559 has 8 divisors (see below), whose sum is σ = 101721200. Its totient is φ = 98119296.

The previous prime is 99915553. The next prime is 99915581. The reversal of 99915559 is 95551999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99915559 - 2¹¹ = 99913511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99915553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21247 + ... + 25519.

It is an arithmetic number, because the mean of its divisors is an integer number (12715150).

Almost surely, 2^99915559 is an apocalyptic number.

99915559 is a deficient number, since it is larger than the sum of its proper divisors (1805641).

99915559 is a wasteful number, since it uses less digits than its factorization.

99915559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4689.

The product of its digits is 820125, while the sum is 52.

The square root of 99915559 is about 9995.7770583382. Note that the first 3 decimals coincide. The cubic root of 99915559 is about 464.0281997700.

The spelling of 99915559 in words is "ninety-nine million, nine hundred fifteen thousand, five hundred fifty-nine".