1009811 has 4 divisors (see below), whose sum is σ = 1101624. Its totient is φ = 918000.

The previous prime is 1009807. The next prime is 1009819. The reversal of 1009811 is 1189001.

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 1009811 - 2² = 1009807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45890 + ... + 45911.

It is an arithmetic number, because the mean of its divisors is an integer number (275406).

2^1009811 is an apocalyptic number.

1009811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1009811 is a deficient number, since it is larger than the sum of its proper divisors (91813).

1009811 is an equidigital number, since it uses as much as digits as its factorization.

1009811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91812.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1009811 is about 1004.8935266982. The cubic root of 1009811 is about 100.3259696169.

The spelling of 1009811 in words is "one million, nine thousand, eight hundred eleven".