990811 has 8 divisors (see below), whose sum is σ = 1058400. Its totient is φ = 924288.

The previous prime is 990809. The next prime is 990841. The reversal of 990811 is 118099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990811 - 2¹ = 990809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990811.

It is not an unprimeable number, because it can be changed into a prime (990841) 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 7 ways as a sum of consecutive naturals, for example, 2665 + ... + 3013.

It is an arithmetic number, because the mean of its divisors is an integer number (132300).

2⁹⁹⁰⁸¹¹ is an apocalyptic number.

990811 is a deficient number, since it is larger than the sum of its proper divisors (67589).

990811 is a wasteful number, since it uses less digits than its factorization.

990811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 990811 is about 995.3948965109. The cubic root of 990811 is about 99.6927569841.

The spelling of 990811 in words is "nine hundred ninety thousand, eight hundred eleven".