2781773321 has 2 divisors, whose sum is σ = 2781773322. Its totient is φ = 2781773320.

The previous prime is 2781773279. The next prime is 2781773347. The reversal of 2781773321 is 1233771872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2440854025 + 340919296 = 49405^2 + 18464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781773321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2781773381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390886660 + 1390886661.

It is an arithmetic number, because the mean of its divisors is an integer number (1390886661).

Almost surely, 2^2781773321 is an apocalyptic number.

It is an amenable number.

2781773321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781773321 is an equidigital number, since it uses as much as digits as its factorization.

2781773321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 41.

The square root of 2781773321 is about 52742.5190998686. The cubic root of 2781773321 is about 1406.3947802713.

The spelling of 2781773321 in words is "two billion, seven hundred eighty-one million, seven hundred seventy-three thousand, three hundred twenty-one".