2781909049 has 2 divisors, whose sum is σ = 2781909050. Its totient is φ = 2781909048.

The previous prime is 2781909017. The next prime is 2781909083. The reversal of 2781909049 is 9409091872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1419782400 + 1362126649 = 37680^2 + 36907^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781909049 - 2⁵ = 2781909017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2781908993 and 2781909011.

It is not a weakly prime, because it can be changed into another prime (2781909349) 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, 1390954524 + 1390954525.

It is an arithmetic number, because the mean of its divisors is an integer number (1390954525).

Almost surely, 2^2781909049 is an apocalyptic number.

It is an amenable number.

2781909049 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781909049 is an equidigital number, since it uses as much as digits as its factorization.

2781909049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 2781909049 is about 52743.8057879786. The cubic root of 2781909049 is about 1406.4176534561.

The spelling of 2781909049 in words is "two billion, seven hundred eighty-one million, nine hundred nine thousand, forty-nine".