99115561 has 8 divisors (see below), whose sum is σ = 100324224. Its totient is φ = 97911840.

The previous prime is 99115547. The next prime is 99115619. The reversal of 99115561 is 16551199.

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 99115561 - 2¹¹ = 99113513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99115561.

It is not an unprimeable number, because it can be changed into a prime (99115501) 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, 52740 + ... + 54586.

It is an arithmetic number, because the mean of its divisors is an integer number (12540528).

Almost surely, 2^99115561 is an apocalyptic number.

It is an amenable number.

99115561 is a deficient number, since it is larger than the sum of its proper divisors (1208663).

99115561 is a wasteful number, since it uses less digits than its factorization.

99115561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471.

The product of its digits is 12150, while the sum is 37.

The square root of 99115561 is about 9955.6798361538. The cubic root of 99115561 is about 462.7864284692.

The spelling of 99115561 in words is "ninety-nine million, one hundred fifteen thousand, five hundred sixty-one".