2778791311 has 2 divisors, whose sum is σ = 2778791312. Its totient is φ = 2778791310.

The previous prime is 2778791243. The next prime is 2778791317. The reversal of 2778791311 is 1131978772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2778791311 - 2⁹ = 2778790799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778791317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389395655 + 1389395656.

It is an arithmetic number, because the mean of its divisors is an integer number (1389395656).

Almost surely, 2^2778791311 is an apocalyptic number.

2778791311 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778791311 is an equidigital number, since it uses as much as digits as its factorization.

2778791311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 46.

The square root of 2778791311 is about 52714.2420129513. The cubic root of 2778791311 is about 1405.8920574519.

The spelling of 2778791311 in words is "two billion, seven hundred seventy-eight million, seven hundred ninety-one thousand, three hundred eleven".