2011991959 has 8 divisors (see below), whose sum is σ = 2017507968. Its totient is φ = 2006484480.

The previous prime is 2011991923. The next prime is 2011992019. The reversal of 2011991959 is 9591991102.

It is a happy number.

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 2011991959 - 2⁷ = 2011991831 is a prime.

It is a super-2 number, since 2×2011991959² = 8096223286161315362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011991659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965799 + ... + 967879.

It is an arithmetic number, because the mean of its divisors is an integer number (252188496).

Almost surely, 2^2011991959 is an apocalyptic number.

2011991959 is a deficient number, since it is larger than the sum of its proper divisors (5516009).

2011991959 is a wasteful number, since it uses less digits than its factorization.

2011991959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4265.

The product of its (nonzero) digits is 65610, while the sum is 46.

The square root of 2011991959 is about 44855.2333513047. The cubic root of 2011991959 is about 1262.4341872565.

The spelling of 2011991959 in words is "two billion, eleven million, nine hundred ninety-one thousand, nine hundred fifty-nine".