105563999 has 4 divisors (see below), whose sum is σ = 111773664. Its totient is φ = 99354336.

The previous prime is 105563989. The next prime is 105564001. The reversal of 105563999 is 999365501.

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

It is a cyclic number.

It is not a de Polignac number, because 105563999 - 2²⁴ = 88786783 is a prime.

It is a super-2 number, since 2×105563999² = 22287515769744002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105563989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3104807 + ... + 3104840.

It is an arithmetic number, because the mean of its divisors is an integer number (27943416).

Almost surely, 2^105563999 is an apocalyptic number.

105563999 is a deficient number, since it is larger than the sum of its proper divisors (6209665).

105563999 is an equidigital number, since it uses as much as digits as its factorization.

105563999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6209664.

The product of its (nonzero) digits is 328050, while the sum is 47.

The square root of 105563999 is about 10274.4342423318. The cubic root of 105563999 is about 472.6125805103.

The spelling of 105563999 in words is "one hundred five million, five hundred sixty-three thousand, nine hundred ninety-nine".