2881649 has 2 divisors, whose sum is σ = 2881650. Its totient is φ = 2881648.

The previous prime is 2881639. The next prime is 2881657. The reversal of 2881649 is 9461882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1600225 + 1281424 = 1265^2 + 1132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2881649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2881639) 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 as a sum of consecutive naturals, namely, 1440824 + 1440825.

It is an arithmetic number, because the mean of its divisors is an integer number (1440825).

2^2881649 is an apocalyptic number.

It is an amenable number.

2881649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2881649 is an equidigital number, since it uses as much as digits as its factorization.

2881649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 2881649 is about 1697.5420466074. The cubic root of 2881649 is about 142.3028812443.

The spelling of 2881649 in words is "two million, eight hundred eighty-one thousand, six hundred forty-nine".