774985993 has 2 divisors, whose sum is σ = 774985994. Its totient is φ = 774985992.

The previous prime is 774985969. The next prime is 774985999. The reversal of 774985993 is 399589477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504811024 + 270174969 = 22468^2 + 16437^2 .

It is a cyclic number.

It is not a de Polignac number, because 774985993 - 2⁹ = 774985481 is a prime.

It is not a weakly prime, because it can be changed into another prime (774985999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387492996 + 387492997.

It is an arithmetic number, because the mean of its divisors is an integer number (387492997).

Almost surely, 2^774985993 is an apocalyptic number.

It is an amenable number.

774985993 is a deficient number, since it is larger than the sum of its proper divisors (1).

774985993 is an equidigital number, since it uses as much as digits as its factorization.

774985993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17146080, while the sum is 61.

The square root of 774985993 is about 27838.5702398668. The cubic root of 774985993 is about 918.5397411830.

The spelling of 774985993 in words is "seven hundred seventy-four million, nine hundred eighty-five thousand, nine hundred ninety-three".