772613921 has 2 divisors, whose sum is σ = 772613922. Its totient is φ = 772613920.

The previous prime is 772613903. The next prime is 772613957. The reversal of 772613921 is 129316277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 765296896 + 7317025 = 27664^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 772613921 - 2⁶ = 772613857 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (772613971) 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, 386306960 + 386306961.

It is an arithmetic number, because the mean of its divisors is an integer number (386306961).

Almost surely, 2^772613921 is an apocalyptic number.

It is an amenable number.

772613921 is a deficient number, since it is larger than the sum of its proper divisors (1).

772613921 is an equidigital number, since it uses as much as digits as its factorization.

772613921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 772613921 is about 27795.9335335225. The cubic root of 772613921 is about 917.6016299552.

The spelling of 772613921 in words is "seven hundred seventy-two million, six hundred thirteen thousand, nine hundred twenty-one".