2780542549 has 2 divisors, whose sum is σ = 2780542550. Its totient is φ = 2780542548.

The previous prime is 2780542543. The next prime is 2780542603. The reversal of 2780542549 is 9452450872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2394144900 + 386397649 = 48930^2 + 19657^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780542549 - 2¹⁹ = 2780018261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2780542499 and 2780542508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780542543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390271274 + 1390271275.

It is an arithmetic number, because the mean of its divisors is an integer number (1390271275).

Almost surely, 2^2780542549 is an apocalyptic number.

It is an amenable number.

2780542549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780542549 is an equidigital number, since it uses as much as digits as its factorization.

2780542549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 46.

The square root of 2780542549 is about 52730.8500690061. The cubic root of 2780542549 is about 1406.1873338620.

The spelling of 2780542549 in words is "two billion, seven hundred eighty million, five hundred forty-two thousand, five hundred forty-nine".