2841781 has 2 divisors, whose sum is σ = 2841782. Its totient is φ = 2841780.

The previous prime is 2841767. The next prime is 2841793. The reversal of 2841781 is 1871482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 695556 = 1465^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 2841781 - 2⁵ = 2841749 is a prime.

It is a super-2 number, since 2×2841781² = 16151438503922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2842781) 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, 1420890 + 1420891.

It is an arithmetic number, because the mean of its divisors is an integer number (1420891).

2^2841781 is an apocalyptic number.

It is an amenable number.

2841781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2841781 is an equidigital number, since it uses as much as digits as its factorization.

2841781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 31.

The square root of 2841781 is about 1685.7582863507. The cubic root of 2841781 is about 141.6435714754.

Subtracting from 2841781 its reverse (1871482), we obtain a cube (970299 = 99³).

The spelling of 2841781 in words is "two million, eight hundred forty-one thousand, seven hundred eighty-one".