774841021 has 2 divisors, whose sum is σ = 774841022. Its totient is φ = 774841020.

The previous prime is 774841019. The next prime is 774841049. The reversal of 774841021 is 120148477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435765625 + 339075396 = 20875^2 + 18414^2 .

It is a cyclic number.

It is not a de Polignac number, because 774841021 - 2¹ = 774841019 is a prime.

Together with 774841019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (774841061) 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, 387420510 + 387420511.

It is an arithmetic number, because the mean of its divisors is an integer number (387420511).

Almost surely, 2^774841021 is an apocalyptic number.

It is an amenable number.

774841021 is a deficient number, since it is larger than the sum of its proper divisors (1).

774841021 is an equidigital number, since it uses as much as digits as its factorization.

774841021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 774841021 is about 27835.9663205717. The cubic root of 774841021 is about 918.4824623638.

Subtracting from 774841021 its product of nonzero digits (12544), we obtain a palindrome (774828477).

Adding to 774841021 its reverse (120148477), we get a palindrome (894989498).

The spelling of 774841021 in words is "seven hundred seventy-four million, eight hundred forty-one thousand, twenty-one".