778563241 has 2 divisors, whose sum is σ = 778563242. Its totient is φ = 778563240.

The previous prime is 778563239. The next prime is 778563251. The reversal of 778563241 is 142365877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 456719641 + 321843600 = 21371^2 + 17940^2 .

It is a cyclic number.

It is not a de Polignac number, because 778563241 - 2¹ = 778563239 is a prime.

Together with 778563239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (778563251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389281620 + 389281621.

It is an arithmetic number, because the mean of its divisors is an integer number (389281621).

Almost surely, 2^778563241 is an apocalyptic number.

It is an amenable number.

778563241 is a deficient number, since it is larger than the sum of its proper divisors (1).

778563241 is an equidigital number, since it uses as much as digits as its factorization.

778563241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 43.

The square root of 778563241 is about 27902.7461193338. The cubic root of 778563241 is about 919.9508641842.

The spelling of 778563241 in words is "seven hundred seventy-eight million, five hundred sixty-three thousand, two hundred forty-one".