2194828777 has 2 divisors, whose sum is σ = 2194828778. Its totient is φ = 2194828776.

The previous prime is 2194828771. The next prime is 2194828781. The reversal of 2194828777 is 7778284912.

2194828777 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 can be written as a sum of positive squares in only one way, i.e., 1885209561 + 309619216 = 43419^2 + 17596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2194828777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2194828771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097414388 + 1097414389.

It is an arithmetic number, because the mean of its divisors is an integer number (1097414389).

Almost surely, 2^2194828777 is an apocalyptic number.

It is an amenable number.

2194828777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2194828777 is an equidigital number, since it uses as much as digits as its factorization.

2194828777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3161088, while the sum is 55.

The square root of 2194828777 is about 46848.9997438579. Note that the first 3 decimals coincide. The cubic root of 2194828777 is about 1299.5716097352.

The spelling of 2194828777 in words is "two billion, one hundred ninety-four million, eight hundred twenty-eight thousand, seven hundred seventy-seven".