11009999 has 32 divisors (see below), whose sum is σ = 15676416. Its totient is φ = 7441920.

The previous prime is 11009989. The next prime is 11010007. The reversal of 11009999 is 99990011.

It is a happy number.

It is not a de Polignac number, because 11009999 - 2⁴ = 11009983 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

11009999 is a modest number, since divided by 9999 gives 1100 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11009959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16694 + ... + 17340.

It is an arithmetic number, because the mean of its divisors is an integer number (489888).

Almost surely, 2^11009999 is an apocalyptic number.

11009999 is a deficient number, since it is larger than the sum of its proper divisors (4666417).

11009999 is a wasteful number, since it uses less digits than its factorization.

11009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 11009999 is about 3318.1318539202. The cubic root of 11009999 is about 222.4653752458.

It can be divided in two parts, 110099 and 99, that multiplied together give a palindrome (10899801).

The spelling of 11009999 in words is "eleven million, nine thousand, nine hundred ninety-nine".