2778841997 has 2 divisors, whose sum is σ = 2778841998. Its totient is φ = 2778841996.

The previous prime is 2778841963. The next prime is 2778841999. The reversal of 2778841997 is 7991488772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1543389796 + 1235452201 = 39286^2 + 35149^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778841997 - 2¹⁴ = 2778825613 is a prime.

Together with 2778841999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778841999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389420998 + 1389420999.

It is an arithmetic number, because the mean of its divisors is an integer number (1389420999).

Almost surely, 2^2778841997 is an apocalyptic number.

It is an amenable number.

2778841997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778841997 is an equidigital number, since it uses as much as digits as its factorization.

2778841997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14224896, while the sum is 62.

The square root of 2778841997 is about 52714.7227726752. The cubic root of 2778841997 is about 1405.9006053664.

The spelling of 2778841997 in words is "two billion, seven hundred seventy-eight million, eight hundred forty-one thousand, nine hundred ninety-seven".