2001311992 has 16 divisors (see below), whose sum is σ = 3779458200. Its totient is φ = 993456480.

The previous prime is 2001311987. The next prime is 2001311993. The reversal of 2001311992 is 2991131002.

It is a self number, because there is not a number n which added to its sum of digits gives 2001311992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001311993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 898759 + ... + 900982.

Almost surely, 2^2001311992 is an apocalyptic number.

It is an amenable number.

2001311992 is a deficient number, since it is larger than the sum of its proper divisors (1778146208).

2001311992 is a wasteful number, since it uses less digits than its factorization.

2001311992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799886 (or 1799882 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 2001311992 is about 44736.0256616522. The cubic root of 2001311992 is about 1260.1964907306.

Adding to 2001311992 its reverse (2991131002), we get a palindrome (4992442994).

The spelling of 2001311992 in words is "two billion, one million, three hundred eleven thousand, nine hundred ninety-two".