775256161 has 2 divisors, whose sum is σ = 775256162. Its totient is φ = 775256160.

The previous prime is 775256099. The next prime is 775256179. The reversal of 775256161 is 161652577.

It is a happy number.

775256161 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., 719902561 + 55353600 = 26831^2 + 7440^2 .

It is an emirp because it is prime and its reverse (161652577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 775256161 - 2⁷ = 775256033 is a prime.

It is not a weakly prime, because it can be changed into another prime (775256191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387628080 + 387628081.

It is an arithmetic number, because the mean of its divisors is an integer number (387628081).

Almost surely, 2^775256161 is an apocalyptic number.

It is an amenable number.

775256161 is a deficient number, since it is larger than the sum of its proper divisors (1).

775256161 is an equidigital number, since it uses as much as digits as its factorization.

775256161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 40.

The square root of 775256161 is about 27843.4222214152. The cubic root of 775256161 is about 918.6464662144.

The spelling of 775256161 in words is "seven hundred seventy-five million, two hundred fifty-six thousand, one hundred sixty-one".