2778730231 has 2 divisors, whose sum is σ = 2778730232. Its totient is φ = 2778730230.

The previous prime is 2778730217. The next prime is 2778730243. The reversal of 2778730231 is 1320378772.

2778730231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2778730231 - 2⁷ = 2778730103 is a prime.

It is a super-2 number, since 2×2778730231² = 15442683393346626722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778730531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389365115 + 1389365116.

It is an arithmetic number, because the mean of its divisors is an integer number (1389365116).

Almost surely, 2^2778730231 is an apocalyptic number.

2778730231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778730231 is an equidigital number, since it uses as much as digits as its factorization.

2778730231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 2778730231 is about 52713.6626596938. The cubic root of 2778730231 is about 1405.8817565085.

The spelling of 2778730231 in words is "two billion, seven hundred seventy-eight million, seven hundred thirty thousand, two hundred thirty-one".