776138849 has 2 divisors, whose sum is σ = 776138850. Its totient is φ = 776138848.

The previous prime is 776138821. The next prime is 776138873. The reversal of 776138849 is 948831677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 736851025 + 39287824 = 27145^2 + 6268^2 .

It is a cyclic number.

It is not a de Polignac number, because 776138849 - 2⁸ = 776138593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 776138849.

It is not a weakly prime, because it can be changed into another prime (776132849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388069424 + 388069425.

It is an arithmetic number, because the mean of its divisors is an integer number (388069425).

Almost surely, 2^776138849 is an apocalyptic number.

It is an amenable number.

776138849 is a deficient number, since it is larger than the sum of its proper divisors (1).

776138849 is an equidigital number, since it uses as much as digits as its factorization.

776138849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 53.

The square root of 776138849 is about 27859.2686372058. The cubic root of 776138849 is about 918.9949835598.

The spelling of 776138849 in words is "seven hundred seventy-six million, one hundred thirty-eight thousand, eight hundred forty-nine".