778248313 has 2 divisors, whose sum is σ = 778248314. Its totient is φ = 778248312.

The previous prime is 778248301. The next prime is 778248353. The reversal of 778248313 is 313842877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 757790784 + 20457529 = 27528^2 + 4523^2 .

It is a cyclic number.

It is not a de Polignac number, because 778248313 - 2⁵ = 778248281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 778248313.

It is not a weakly prime, because it can be changed into another prime (778248353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389124156 + 389124157.

It is an arithmetic number, because the mean of its divisors is an integer number (389124157).

Almost surely, 2^778248313 is an apocalyptic number.

It is an amenable number.

778248313 is a deficient number, since it is larger than the sum of its proper divisors (1).

778248313 is an equidigital number, since it uses as much as digits as its factorization.

778248313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The square root of 778248313 is about 27897.1022330277. The cubic root of 778248313 is about 919.8268077416.

The spelling of 778248313 in words is "seven hundred seventy-eight million, two hundred forty-eight thousand, three hundred thirteen".