2778913 has 2 divisors, whose sum is σ = 2778914. Its totient is φ = 2778912.

The previous prime is 2778911. The next prime is 2778917. The reversal of 2778913 is 3198772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1595169 + 1183744 = 1263^2 + 1088^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778913 - 2¹ = 2778911 is a prime.

Together with 2778911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2778911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389456 + 1389457.

It is an arithmetic number, because the mean of its divisors is an integer number (1389457).

2^2778913 is an apocalyptic number.

It is an amenable number.

2778913 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778913 is an equidigital number, since it uses as much as digits as its factorization.

2778913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 2778913 is about 1667.0071985447. The cubic root of 2778913 is about 140.5912579456.

The spelling of 2778913 in words is "two million, seven hundred seventy-eight thousand, nine hundred thirteen".