2733781 has 2 divisors, whose sum is σ = 2733782. Its totient is φ = 2733780.

The previous prime is 2733779. The next prime is 2733791. The reversal of 2733781 is 1873372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2531281 + 202500 = 1591^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 2733781 - 2¹ = 2733779 is a prime.

It is a super-2 number, since 2×2733781² = 14947117111922, which contains 22 as substring.

Together with 2733779, it forms a pair of twin primes.

2733781 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2733791) 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, 1366890 + 1366891.

It is an arithmetic number, because the mean of its divisors is an integer number (1366891).

2^2733781 is an apocalyptic number.

It is an amenable number.

2733781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2733781 is an equidigital number, since it uses as much as digits as its factorization.

2733781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 2733781 is about 1653.4149509424. The cubic root of 2733781 is about 139.8259912938.

The spelling of 2733781 in words is "two million, seven hundred thirty-three thousand, seven hundred eighty-one".