2781984493 has 2 divisors, whose sum is σ = 2781984494. Its totient is φ = 2781984492.

The previous prime is 2781984487. The next prime is 2781984509. The reversal of 2781984493 is 3944891872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2130560964 + 651423529 = 46158^2 + 25523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781984493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781984463) 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, 1390992246 + 1390992247.

It is an arithmetic number, because the mean of its divisors is an integer number (1390992247).

Almost surely, 2^2781984493 is an apocalyptic number.

It is an amenable number.

2781984493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781984493 is an equidigital number, since it uses as much as digits as its factorization.

2781984493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The square root of 2781984493 is about 52744.5209761166. The cubic root of 2781984493 is about 1406.4303671253.

The spelling of 2781984493 in words is "two billion, seven hundred eighty-one million, nine hundred eighty-four thousand, four hundred ninety-three".