2773681 has 2 divisors, whose sum is σ = 2773682. Its totient is φ = 2773680.

The previous prime is 2773679. The next prime is 2773697. The reversal of 2773681 is 1863772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1690000 + 1083681 = 1300^2 + 1041^2 .

It is a cyclic number.

It is not a de Polignac number, because 2773681 - 2¹ = 2773679 is a prime.

It is a super-2 number, since 2×2773681² = 15386612579522, which contains 22 as substring.

Together with 2773679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2773621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1386840 + 1386841.

It is an arithmetic number, because the mean of its divisors is an integer number (1386841).

2^2773681 is an apocalyptic number.

It is an amenable number.

2773681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2773681 is an equidigital number, since it uses as much as digits as its factorization.

2773681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 2773681 is about 1665.4371798420. The cubic root of 2773681 is about 140.5029697578.

Subtracting from 2773681 its reverse (1863772), we obtain a palindrome (909909).

The spelling of 2773681 in words is "two million, seven hundred seventy-three thousand, six hundred eighty-one".