2781349 has 2 divisors, whose sum is σ = 2781350. Its totient is φ = 2781348.

The previous prime is 2781347. The next prime is 2781377. The reversal of 2781349 is 9431872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 1117249 = 1290^2 + 1057^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781349 - 2¹ = 2781347 is a prime.

Together with 2781347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390674 + 1390675.

It is an arithmetic number, because the mean of its divisors is an integer number (1390675).

2^2781349 is an apocalyptic number.

It is an amenable number.

2781349 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781349 is an equidigital number, since it uses as much as digits as its factorization.

2781349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 2781349 is about 1667.7376892065. The cubic root of 2781349 is about 140.6323267952.

The spelling of 2781349 in words is "two million, seven hundred eighty-one thousand, three hundred forty-nine".