2001111231 has 16 divisors (see below), whose sum is σ = 3123687168. Its totient is φ = 1115601600.

The previous prime is 2001111227. The next prime is 2001111263. The reversal of 2001111231 is 1321111002.

It is not a de Polignac number, because 2001111231 - 2² = 2001111227 is a prime.

It is a super-2 number, since 2×2001111231² = 8008892317668670722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001111221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1161225 + ... + 1162946.

It is an arithmetic number, because the mean of its divisors is an integer number (195230448).

Almost surely, 2^2001111231 is an apocalyptic number.

2001111231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2001111231 is a deficient number, since it is larger than the sum of its proper divisors (1122575937).

2001111231 is a wasteful number, since it uses less digits than its factorization.

2001111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324222.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 2001111231 is about 44733.7817650151. The cubic root of 2001111231 is about 1260.1543505797.

Adding to 2001111231 its reverse (1321111002), we get a palindrome (3322222233).

The spelling of 2001111231 in words is "two billion, one million, one hundred eleven thousand, two hundred thirty-one".