775288321 has 2 divisors, whose sum is σ = 775288322. Its totient is φ = 775288320.

The previous prime is 775288277. The next prime is 775288337. The reversal of 775288321 is 123882577.

775288321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 426009600 + 349278721 = 20640^2 + 18689^2 .

It is a cyclic number.

It is not a de Polignac number, because 775288321 - 2¹¹ = 775286273 is a prime.

It is not a weakly prime, because it can be changed into another prime (775288351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387644160 + 387644161.

It is an arithmetic number, because the mean of its divisors is an integer number (387644161).

Almost surely, 2^775288321 is an apocalyptic number.

It is an amenable number.

775288321 is a deficient number, since it is larger than the sum of its proper divisors (1).

775288321 is an equidigital number, since it uses as much as digits as its factorization.

775288321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 775288321 is about 27843.9997306421. Note that the first 3 decimals coincide. The cubic root of 775288321 is about 918.6591687951.

It can be divided in two parts, 77528 and 8321, that added together give a square (85849 = 293²).

The spelling of 775288321 in words is "seven hundred seventy-five million, two hundred eighty-eight thousand, three hundred twenty-one".