774684649 has 2 divisors, whose sum is σ = 774684650. Its totient is φ = 774684648.

The previous prime is 774684593. The next prime is 774684653. The reversal of 774684649 is 946486477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 766459225 + 8225424 = 27685^2 + 2868^2 .

It is a cyclic number.

It is not a de Polignac number, because 774684649 - 2¹³ = 774676457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 774684649.

It is not a weakly prime, because it can be changed into another prime (774684149) 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, 387342324 + 387342325.

It is an arithmetic number, because the mean of its divisors is an integer number (387342325).

Almost surely, 2^774684649 is an apocalyptic number.

It is an amenable number.

774684649 is a deficient number, since it is larger than the sum of its proper divisors (1).

774684649 is an equidigital number, since it uses as much as digits as its factorization.

774684649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 55.

The square root of 774684649 is about 27833.1573667092. The cubic root of 774684649 is about 918.4206713648.

The spelling of 774684649 in words is "seven hundred seventy-four million, six hundred eighty-four thousand, six hundred forty-nine".