10999 has 4 divisors (see below), whose sum is σ = 11664. Its totient is φ = 10336.

The previous prime is 10993. The next prime is 11003. The reversal of 10999 is 99901.

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

It is not a de Polignac number, because 10999 - 2⁹ = 10487 is a prime.

It is an Ulam number.

It is a Duffinian number.

10999 is a modest number, since divided by 999 gives 10 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10993) 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, 307 + ... + 340.

It is an arithmetic number, because the mean of its divisors is an integer number (2916).

2¹⁰⁹⁹⁹ is an apocalyptic number.

10999 is a deficient number, since it is larger than the sum of its proper divisors (665).

10999 is an equidigital number, since it uses as much as digits as its factorization.

10999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 10999 is about 104.8761173957. The cubic root of 10999 is about 22.2391269519.

The spelling of 10999 in words is "ten thousand, nine hundred ninety-nine".