2001731 has 2 divisors, whose sum is σ = 2001732. Its totient is φ = 2001730.

The previous prime is 2001721. The next prime is 2001751. The reversal of 2001731 is 1371002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001731 - 2¹⁸ = 1739587 is a prime.

It is a super-2 number, since 2×2001731² = 8013853992722, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2001721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000865 + 1000866.

It is an arithmetic number, because the mean of its divisors is an integer number (1000866).

2^2001731 is an apocalyptic number.

2001731 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001731 is an equidigital number, since it uses as much as digits as its factorization.

2001731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 2001731 is about 1414.8254309278. The cubic root of 2001731 is about 126.0284432302.

Adding to 2001731 its reverse (1371002), we get a palindrome (3372733).

The spelling of 2001731 in words is "two million, one thousand, seven hundred thirty-one".