2001131111 has 4 divisors (see below), whose sum is σ = 2287006992. Its totient is φ = 1715255232.

The previous prime is 2001131101. The next prime is 2001131117. The reversal of 2001131111 is 1111311002.

It is a happy number.

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 2001131111 - 2²⁶ = 1934022247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001131092 and 2001131101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001131117) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 142937930 + ... + 142937943.

It is an arithmetic number, because the mean of its divisors is an integer number (571751748).

Almost surely, 2^2001131111 is an apocalyptic number.

2001131111 is a deficient number, since it is larger than the sum of its proper divisors (285875881).

2001131111 is an equidigital number, since it uses as much as digits as its factorization.

2001131111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285875880.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 2001131111 is about 44734.0039678990. The cubic root of 2001131111 is about 1260.1585235588.

Adding to 2001131111 its reverse (1111311002), we get a palindrome (3112442113).

It can be divided in two parts, 200 and 1131111, that added together give a palindrome (1131311).

The spelling of 2001131111 in words is "two billion, one million, one hundred thirty-one thousand, one hundred eleven".