2741821 has 2 divisors, whose sum is σ = 2741822. Its totient is φ = 2741820.

The previous prime is 2741813. The next prime is 2741867. The reversal of 2741821 is 1281472.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2722500 + 19321 = 1650^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 2741821 - 2³ = 2741813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2741801) 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, 1370910 + 1370911.

It is an arithmetic number, because the mean of its divisors is an integer number (1370911).

2^2741821 is an apocalyptic number.

It is an amenable number.

2741821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2741821 is an equidigital number, since it uses as much as digits as its factorization.

2741821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 25.

The square root of 2741821 is about 1655.8444975299. The cubic root of 2741821 is about 139.9629323634.

The spelling of 2741821 in words is "two million, seven hundred forty-one thousand, eight hundred twenty-one".