2001131331 has 4 divisors (see below), whose sum is σ = 2668175112. Its totient is φ = 1334087552.

The previous prime is 2001131323. The next prime is 2001131339. The reversal of 2001131331 is 1331311002.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2001131323) and next prime (2001131339).

It is a cyclic number.

It is not a de Polignac number, because 2001131331 - 2³ = 2001131323 is a prime.

It is a super-2 number, since 2×2001131331² = 8009053207819663122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2001131331.

It is not an unprimeable number, because it can be changed into a prime (2001131339) 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, 333521886 + ... + 333521891.

It is an arithmetic number, because the mean of its divisors is an integer number (667043778).

Almost surely, 2^2001131331 is an apocalyptic number.

2001131331 is a deficient number, since it is larger than the sum of its proper divisors (667043781).

2001131331 is an equidigital number, since it uses as much as digits as its factorization.

2001131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667043780.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 2001131331 is about 44734.0064268784. The cubic root of 2001131331 is about 1260.1585697385.

Adding to 2001131331 its reverse (1331311002), we get a palindrome (3332442333).

The spelling of 2001131331 in words is "two billion, one million, one hundred thirty-one thousand, three hundred thirty-one".