6609881 has 2 divisors, whose sum is σ = 6609882. Its totient is φ = 6609880.

The previous prime is 6609877. The next prime is 6609893. The reversal of 6609881 is 1889066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6375625 + 234256 = 2525^2 + 484^2 .

It is a cyclic number.

It is not a de Polignac number, because 6609881 - 2² = 6609877 is a prime.

It is a super-3 number, since 3×6609881³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (6609181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3304940 + 3304941.

It is an arithmetic number, because the mean of its divisors is an integer number (3304941).

Almost surely, 2^6609881 is an apocalyptic number.

It is an amenable number.

6609881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6609881 is an equidigital number, since it uses as much as digits as its factorization.

6609881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 6609881 is about 2570.9688835145. The cubic root of 6609881 is about 187.6713077348.

The spelling of 6609881 in words is "six million, six hundred nine thousand, eight hundred eighty-one".