712776809 has 2 divisors, whose sum is σ = 712776810. Its totient is φ = 712776808.

The previous prime is 712776803. The next prime is 712776821. The reversal of 712776809 is 908677217.

712776809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515290000 + 197486809 = 22700^2 + 14053^2 .

It is a cyclic number.

It is not a de Polignac number, because 712776809 - 2⁴ = 712776793 is a prime.

It is not a weakly prime, because it can be changed into another prime (712776803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 356388404 + 356388405.

It is an arithmetic number, because the mean of its divisors is an integer number (356388405).

Almost surely, 2^712776809 is an apocalyptic number.

It is an amenable number.

712776809 is a deficient number, since it is larger than the sum of its proper divisors (1).

712776809 is an equidigital number, since it uses as much as digits as its factorization.

712776809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 47.

The square root of 712776809 is about 26697.8802342059. The cubic root of 712776809 is about 893.2736439878.

The spelling of 712776809 in words is "seven hundred twelve million, seven hundred seventy-six thousand, eight hundred nine".