2001001111 has 4 divisors (see below), whose sum is σ = 2001410224. Its totient is φ = 2000592000.

The previous prime is 2001001109. The next prime is 2001001147. The reversal of 2001001111 is 1111001002.

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 2001001111 - 2¹ = 2001001109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001001094 and 2001001103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001001411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197130 + ... + 207031.

It is an arithmetic number, because the mean of its divisors is an integer number (500352556).

Almost surely, 2^2001001111 is an apocalyptic number.

2001001111 is a deficient number, since it is larger than the sum of its proper divisors (409113).

2001001111 is an equidigital number, since it uses as much as digits as its factorization.

2001001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409112.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 2001001111 is about 44732.5509109418. The cubic root of 2001001111 is about 1260.1312349660.

Adding to 2001001111 its reverse (1111001002), we get a palindrome (3112002113).

The spelling of 2001001111 in words is "two billion, one million, one thousand, one hundred eleven".