2001331 has 2 divisors, whose sum is σ = 2001332. Its totient is φ = 2001330.

The previous prime is 2001313. The next prime is 2001347. The reversal of 2001331 is 1331002.

Together with previous prime (2001313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001331 - 2¹⁵ = 1968563 is a prime.

It is a super-2 number, since 2×2001331² = 8010651543122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2001361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000665 + 1000666.

It is an arithmetic number, because the mean of its divisors is an integer number (1000666).

2^2001331 is an apocalyptic number.

2001331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001331 is an equidigital number, since it uses as much as digits as its factorization.

2001331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 2001331 is about 1414.6840636693. The cubic root of 2001331 is about 126.0200480403.

Adding to 2001331 its reverse (1331002), we get a palindrome (3332333).

It can be divided in two parts, 2001 and 331, that added together give a palindrome (2332).

The spelling of 2001331 in words is "two million, one thousand, three hundred thirty-one".