2887721 has 2 divisors, whose sum is σ = 2887722. Its totient is φ = 2887720.

The previous prime is 2887711. The next prime is 2887741. The reversal of 2887721 is 1277882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 1132096 = 1325^2 + 1064^2 .

It is a cyclic number.

It is not a de Polignac number, because 2887721 - 2⁶ = 2887657 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 (2887711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1443860 + 1443861.

It is an arithmetic number, because the mean of its divisors is an integer number (1443861).

2^2887721 is an apocalyptic number.

It is an amenable number.

2887721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2887721 is an equidigital number, since it uses as much as digits as its factorization.

2887721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12544, while the sum is 35.

The square root of 2887721 is about 1699.3295736849. The cubic root of 2887721 is about 142.4027611982.

The spelling of 2887721 in words is "two million, eight hundred eighty-seven thousand, seven hundred twenty-one".