105549999 has 4 divisors (see below), whose sum is σ = 140733336. Its totient is φ = 70366664.

The previous prime is 105549989. The next prime is 105550037. The reversal of 105549999 is 999945501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999945501 = 3 ⋅333315167.

It is a cyclic number.

It is not a de Polignac number, because 105549999 - 2⁹ = 105549487 is a prime.

It is a super-2 number, since 2×105549999² = 22281604577800002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105549929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17591664 + ... + 17591669.

It is an arithmetic number, because the mean of its divisors is an integer number (35183334).

Almost surely, 2^105549999 is an apocalyptic number.

105549999 is a deficient number, since it is larger than the sum of its proper divisors (35183337).

105549999 is an equidigital number, since it uses as much as digits as its factorization.

105549999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35183336.

The product of its (nonzero) digits is 656100, while the sum is 51.

The square root of 105549999 is about 10273.7529170211. The cubic root of 105549999 is about 472.5916868069.

It can be divided in two parts, 1055499 and 99, that multiplied together give a palindrome (104494401).

The spelling of 105549999 in words is "one hundred five million, five hundred forty-nine thousand, nine hundred ninety-nine".