10999809 has 12 divisors (see below), whose sum is σ = 16047252. Its totient is φ = 7260000.

The previous prime is 10999771. The next prime is 10999811. The reversal of 10999809 is 90899901.

It can be written as a sum of positive squares in 2 ways, for example, as 10870209 + 129600 = 3297^2 + 360^2 .

It is not a de Polignac number, because 10999809 - 2¹¹ = 10997761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10999829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5142 + ... + 6959.

It is an arithmetic number, because the mean of its divisors is an integer number (1337271).

Almost surely, 2^10999809 is an apocalyptic number.

It is an amenable number.

10999809 is a deficient number, since it is larger than the sum of its proper divisors (5047443).

10999809 is a wasteful number, since it uses less digits than its factorization.

10999809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12208 (or 12205 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 10999809 is about 3316.5959958970. The cubic root of 10999809 is about 222.3967218368.

The spelling of 10999809 in words is "ten million, nine hundred ninety-nine thousand, eight hundred nine".