1099811 has 4 divisors (see below), whose sum is σ = 1125432. Its totient is φ = 1074192.

The previous prime is 1099807. The next prime is 1099817. The reversal of 1099811 is 1189901.

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

It is a cyclic number.

It is not a de Polignac number, because 1099811 - 2² = 1099807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1099817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12746 + ... + 12831.

It is an arithmetic number, because the mean of its divisors is an integer number (281358).

2^1099811 is an apocalyptic number.

1099811 is a deficient number, since it is larger than the sum of its proper divisors (25621).

1099811 is an equidigital number, since it uses as much as digits as its factorization.

1099811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25620.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1099811 is about 1048.7187420848. The cubic root of 1099811 is about 103.2220990572. Note that the first 3 decimals are identical.

The spelling of 1099811 in words is "one million, ninety-nine thousand, eight hundred eleven".