778771313 has 2 divisors, whose sum is σ = 778771314. Its totient is φ = 778771312.

The previous prime is 778771291. The next prime is 778771333. The reversal of 778771313 is 313177877.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 712462864 + 66308449 = 26692^2 + 8143^2 .

It is a cyclic number.

It is not a de Polignac number, because 778771313 - 2¹² = 778767217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (778771333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389385656 + 389385657.

It is an arithmetic number, because the mean of its divisors is an integer number (389385657).

Almost surely, 2^778771313 is an apocalyptic number.

It is an amenable number.

778771313 is a deficient number, since it is larger than the sum of its proper divisors (1).

778771313 is an equidigital number, since it uses as much as digits as its factorization.

778771313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172872, while the sum is 44.

The square root of 778771313 is about 27906.4743921550. The cubic root of 778771313 is about 920.0328095577.

The spelling of 778771313 in words is "seven hundred seventy-eight million, seven hundred seventy-one thousand, three hundred thirteen".