2002681 has 2 divisors, whose sum is σ = 2002682. Its totient is φ = 2002680.

The previous prime is 2002673. The next prime is 2002723. The reversal of 2002681 is 1862002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1648656 + 354025 = 1284^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002681 - 2³ = 2002673 is a prime.

It is a super-2 number, since 2×2002681² = 8021462375522, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2002621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001340 + 1001341.

It is an arithmetic number, because the mean of its divisors is an integer number (1001341).

2^2002681 is an apocalyptic number.

It is an amenable number.

2002681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002681 is an equidigital number, since it uses as much as digits as its factorization.

2002681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2002681 is about 1415.1611215688. The cubic root of 2002681 is about 126.0483773249.

Adding to 2002681 its reverse (1862002), we get a palindrome (3864683).

The spelling of 2002681 in words is "two million, two thousand, six hundred eighty-one".