775622489 has 2 divisors, whose sum is σ = 775622490. Its totient is φ = 775622488.

The previous prime is 775622483. The next prime is 775622513. The reversal of 775622489 is 984226577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630010000 + 145612489 = 25100^2 + 12067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775622489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (775622483) 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, 387811244 + 387811245.

It is an arithmetic number, because the mean of its divisors is an integer number (387811245).

Almost surely, 2^775622489 is an apocalyptic number.

It is an amenable number.

775622489 is a deficient number, since it is larger than the sum of its proper divisors (1).

775622489 is an equidigital number, since it uses as much as digits as its factorization.

775622489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 50.

The square root of 775622489 is about 27849.9998025135. Note that the first 3 decimals coincide. The cubic root of 775622489 is about 918.7911379362.

The spelling of 775622489 in words is "seven hundred seventy-five million, six hundred twenty-two thousand, four hundred eighty-nine".