2818771993 has 2 divisors, whose sum is σ = 2818771994. Its totient is φ = 2818771992.

The previous prime is 2818771973. The next prime is 2818772039. The reversal of 2818771993 is 3991778182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2378317824 + 440454169 = 48768^2 + 20987^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2818771993 is a prime.

It is not a weakly prime, because it can be changed into another prime (2818771913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1409385996 + 1409385997.

It is an arithmetic number, because the mean of its divisors is an integer number (1409385997).

Almost surely, 2^2818771993 is an apocalyptic number.

It is an amenable number.

2818771993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2818771993 is an equidigital number, since it uses as much as digits as its factorization.

2818771993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 55.

The square root of 2818771993 is about 53092.1085755689. The cubic root of 2818771993 is about 1412.6025392238.

The spelling of 2818771993 in words is "two billion, eight hundred eighteen million, seven hundred seventy-one thousand, nine hundred ninety-three".