105599999 has 4 divisors (see below), whose sum is σ = 106042080. Its totient is φ = 105157920.

The previous prime is 105599993. The next prime is 105600007. The reversal of 105599999 is 999995501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999995501 = 499 ⋅2003999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105599999 is a prime.

It is a super-2 number, since 2×105599999² = 22302719577600002, which contains 22 as substring.

It is a Duffinian number.

105599999 is a modest number, since divided by 99999 gives 1055 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105599993) 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, 220682 + ... + 221159.

It is an arithmetic number, because the mean of its divisors is an integer number (26510520).

Almost surely, 2^105599999 is an apocalyptic number.

105599999 is a deficient number, since it is larger than the sum of its proper divisors (442081).

105599999 is an equidigital number, since it uses as much as digits as its factorization.

105599999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442080.

The product of its (nonzero) digits is 1476225, while the sum is 56.

The square root of 105599999 is about 10276.1860142759. The cubic root of 105599999 is about 472.6662986950. Note that the first 3 decimals are identical.

The spelling of 105599999 in words is "one hundred five million, five hundred ninety-nine thousand, nine hundred ninety-nine".