2001771 has 6 divisors (see below), whose sum is σ = 2891460. Its totient is φ = 1334508.

The previous prime is 2001751. The next prime is 2001787. The reversal of 2001771 is 1771002.

It is a de Polignac number, because none of the positive numbers 2^k-2001771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111201 + ... + 111218.

It is an arithmetic number, because the mean of its divisors is an integer number (481910).

2^2001771 is an apocalyptic number.

2001771 is a deficient number, since it is larger than the sum of its proper divisors (889689).

2001771 is a wasteful number, since it uses less digits than its factorization.

2001771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222425 (or 222422 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 2001771 is about 1414.8395668768. The cubic root of 2001771 is about 126.0292826877.

Adding to 2001771 its reverse (1771002), we get a palindrome (3772773).

It can be divided in two parts, 2001 and 771, that added together give a palindrome (2772).

The spelling of 2001771 in words is "two million, one thousand, seven hundred seventy-one".