99563819 has 4 divisors (see below), whose sum is σ = 104804040. Its totient is φ = 94323600.

The previous prime is 99563777. The next prime is 99563831. The reversal of 99563819 is 91836599.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 99563819 - 2²⁴ = 82786603 is a prime.

It is a super-2 number, since 2×99563819² = 19825908107729522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99563869) 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 in 3 ways as a sum of consecutive naturals, for example, 2620082 + ... + 2620119.

It is an arithmetic number, because the mean of its divisors is an integer number (26201010).

Almost surely, 2^99563819 is an apocalyptic number.

99563819 is a deficient number, since it is larger than the sum of its proper divisors (5240221).

99563819 is a wasteful number, since it uses less digits than its factorization.

99563819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5240220.

The product of its digits is 524880, while the sum is 50.

The square root of 99563819 is about 9978.1671162594. The cubic root of 99563819 is about 463.4830421568.

The spelling of 99563819 in words is "ninety-nine million, five hundred sixty-three thousand, eight hundred nineteen".