990911 has 4 divisors (see below), whose sum is σ = 1000824. Its totient is φ = 981000.

The previous prime is 990893. The next prime is 990917. The reversal of 990911 is 119099.

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 990911 - 2¹⁰ = 989887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990917) 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, 4805 + ... + 5006.

It is an arithmetic number, because the mean of its divisors is an integer number (250206).

2⁹⁹⁰⁹¹¹ is an apocalyptic number.

990911 is a deficient number, since it is larger than the sum of its proper divisors (9913).

990911 is a wasteful number, since it uses less digits than its factorization.

990911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9912.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 990911 is about 995.4451265640. The cubic root of 990911 is about 99.6961107822.

The spelling of 990911 in words is "nine hundred ninety thousand, nine hundred eleven".