2001991010 has 16 divisors (see below), whose sum is σ = 3636646200. Its totient is φ = 793449216.

The previous prime is 2001991003. The next prime is 2001991039. The reversal of 2001991010 is 101991002.

It can be written as a sum of positive squares in 4 ways, for example, as 1873418089 + 128572921 = 43283^2 + 11339^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 917255 + ... + 919434.

Almost surely, 2^2001991010 is an apocalyptic number.

2001991010 is a deficient number, since it is larger than the sum of its proper divisors (1634655190).

2001991010 is a wasteful number, since it uses less digits than its factorization.

2001991010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836805.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 2001991010 is about 44743.6141812438. The cubic root of 2001991010 is about 1260.3389971376.

The spelling of 2001991010 in words is "two billion, one million, nine hundred ninety-one thousand, ten".