775057321 has 2 divisors, whose sum is σ = 775057322. Its totient is φ = 775057320.

The previous prime is 775057271. The next prime is 775057331. The reversal of 775057321 is 123750577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639078400 + 135978921 = 25280^2 + 11661^2 .

It is a cyclic number.

It is not a de Polignac number, because 775057321 - 2⁷ = 775057193 is a prime.

It is not a weakly prime, because it can be changed into another prime (775057331) 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, 387528660 + 387528661.

It is an arithmetic number, because the mean of its divisors is an integer number (387528661).

Almost surely, 2^775057321 is an apocalyptic number.

It is an amenable number.

775057321 is a deficient number, since it is larger than the sum of its proper divisors (1).

775057321 is an equidigital number, since it uses as much as digits as its factorization.

775057321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51450, while the sum is 37.

The square root of 775057321 is about 27839.8513106662. The cubic root of 775057321 is about 918.5679204418.

The spelling of 775057321 in words is "seven hundred seventy-five million, fifty-seven thousand, three hundred twenty-one".