2877221 has 2 divisors, whose sum is σ = 2877222. Its totient is φ = 2877220.

The previous prime is 2877197. The next prime is 2877223. The reversal of 2877221 is 1227782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2402500 + 474721 = 1550^2 + 689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2877221 is a prime.

It is a Sophie Germain prime.

Together with 2877223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2877223) 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, 1438610 + 1438611.

It is an arithmetic number, because the mean of its divisors is an integer number (1438611).

2^2877221 is an apocalyptic number.

It is an amenable number.

2877221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2877221 is an equidigital number, since it uses as much as digits as its factorization.

2877221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 29.

The square root of 2877221 is about 1696.2373065111. The cubic root of 2877221 is about 142.2299553855.

The spelling of 2877221 in words is "two million, eight hundred seventy-seven thousand, two hundred twenty-one".