991000010011 has 16 divisors (see below), whose sum is σ = 1129562058240. Its totient is φ = 860618373120.

The previous prime is 991000010003. The next prime is 991000010027. The reversal of 991000010011 is 110010000199.

It is not a de Polignac number, because 991000010011 - 2³ = 991000010003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991000010051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2352255 + ... + 2741368.

It is an arithmetic number, because the mean of its divisors is an integer number (70597628640).

Almost surely, 2^991000010011 is an apocalyptic number.

991000010011 is a deficient number, since it is larger than the sum of its proper divisors (138562048229).

991000010011 is a wasteful number, since it uses less digits than its factorization.

991000010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094426.

The product of its (nonzero) digits is 81, while the sum is 22.

The spelling of 991000010011 in words is "nine hundred ninety-one billion, ten thousand, eleven".