11001999 has 4 divisors (see below), whose sum is σ = 14669336. Its totient is φ = 7334664.

The previous prime is 11001983. The next prime is 11002001. The reversal of 11001999 is 99910011.

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

It is not a de Polignac number, because 11001999 - 2⁴ = 11001983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001919) 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, 1833664 + ... + 1833669.

It is an arithmetic number, because the mean of its divisors is an integer number (3667334).

Almost surely, 2^11001999 is an apocalyptic number.

11001999 is a deficient number, since it is larger than the sum of its proper divisors (3667337).

11001999 is an equidigital number, since it uses as much as digits as its factorization.

11001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667336.

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 11001999 is about 3316.9261372542. The cubic root of 11001999 is about 222.4114801688.

The spelling of 11001999 in words is "eleven million, one thousand, nine hundred ninety-nine".