2778872111 has 2 divisors, whose sum is σ = 2778872112. Its totient is φ = 2778872110.

The previous prime is 2778872099. The next prime is 2778872149. The reversal of 2778872111 is 1112788772.

2778872111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2778872111 - 2¹⁴ = 2778855727 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778872171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389436055 + 1389436056.

It is an arithmetic number, because the mean of its divisors is an integer number (1389436056).

Almost surely, 2^2778872111 is an apocalyptic number.

2778872111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778872111 is an equidigital number, since it uses as much as digits as its factorization.

2778872111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87808, while the sum is 44.

The square root of 2778872111 is about 52715.0084036795. The cubic root of 2778872111 is about 1405.9056838772.

It can be divided in two parts, 27788 and 72111, that added together give a palindrome (99899).

The spelling of 2778872111 in words is "two billion, seven hundred seventy-eight million, eight hundred seventy-two thousand, one hundred eleven".