775803641 has 2 divisors, whose sum is σ = 775803642. Its totient is φ = 775803640.

The previous prime is 775803629. The next prime is 775803643. The reversal of 775803641 is 146308577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 774008041 + 1795600 = 27821^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 775803641 - 2⁶ = 775803577 is a prime.

It is a Sophie Germain prime.

Together with 775803643, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (775803643) 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, 387901820 + 387901821.

It is an arithmetic number, because the mean of its divisors is an integer number (387901821).

Almost surely, 2^775803641 is an apocalyptic number.

It is an amenable number.

775803641 is a deficient number, since it is larger than the sum of its proper divisors (1).

775803641 is an equidigital number, since it uses as much as digits as its factorization.

775803641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 775803641 is about 27853.2518927324. The cubic root of 775803641 is about 918.8626623777.

The spelling of 775803641 in words is "seven hundred seventy-five million, eight hundred three thousand, six hundred forty-one".