6641881 has 4 divisors (see below), whose sum is σ = 6710452. Its totient is φ = 6573312.

The previous prime is 6641867. The next prime is 6641891. The reversal of 6641881 is 1881466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1881466 = 2 ⋅940733.

It can be written as a sum of positive squares in 2 ways, for example, as 1713481 + 4928400 = 1309^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 6641881 - 2⁷ = 6641753 is a prime.

It is a super-2 number, since 2×6641881² = 88229166436322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6641821) 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, 34140 + ... + 34333.

It is an arithmetic number, because the mean of its divisors is an integer number (1677613).

Almost surely, 2^6641881 is an apocalyptic number.

It is an amenable number.

6641881 is a deficient number, since it is larger than the sum of its proper divisors (68571).

6641881 is an equidigital number, since it uses as much as digits as its factorization.

6641881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68570.

The product of its digits is 9216, while the sum is 34.

The square root of 6641881 is about 2577.1847042849. The cubic root of 6641881 is about 187.9736740714.

The spelling of 6641881 in words is "six million, six hundred forty-one thousand, eight hundred eighty-one".