2799221 has 2 divisors, whose sum is σ = 2799222. Its totient is φ = 2799220.

The previous prime is 2799217. The next prime is 2799233. The reversal of 2799221 is 1229972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2220100 + 579121 = 1490^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2799221 - 2² = 2799217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2799211) 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, 1399610 + 1399611.

It is an arithmetic number, because the mean of its divisors is an integer number (1399611).

2^2799221 is an apocalyptic number.

It is an amenable number.

2799221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2799221 is an equidigital number, since it uses as much as digits as its factorization.

2799221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 2799221 is about 1673.0872661042. The cubic root of 2799221 is about 140.9329023677.

The spelling of 2799221 in words is "two million, seven hundred ninety-nine thousand, two hundred twenty-one".