2782805813 has 2 divisors, whose sum is σ = 2782805814. Its totient is φ = 2782805812.

The previous prime is 2782805791. The next prime is 2782805887. The reversal of 2782805813 is 3185082872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2383685329 + 399120484 = 48823^2 + 19978^2 .

It is a cyclic number.

It is not a de Polignac number, because 2782805813 - 2⁶ = 2782805749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2782805413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1391402906 + 1391402907.

It is an arithmetic number, because the mean of its divisors is an integer number (1391402907).

Almost surely, 2^2782805813 is an apocalyptic number.

It is an amenable number.

2782805813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2782805813 is an equidigital number, since it uses as much as digits as its factorization.

2782805813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 2782805813 is about 52752.3062339458. The cubic root of 2782805813 is about 1406.5687594295.

The spelling of 2782805813 in words is "two billion, seven hundred eighty-two million, eight hundred five thousand, eight hundred thirteen".