720955909 has 2 divisors, whose sum is σ = 720955910. Its totient is φ = 720955908.

The previous prime is 720955897. The next prime is 720955913. The reversal of 720955909 is 909559027.

720955909 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., 714065284 + 6890625 = 26722^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 720955909 - 2¹¹ = 720953861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720955919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360477954 + 360477955.

It is an arithmetic number, because the mean of its divisors is an integer number (360477955).

Almost surely, 2^720955909 is an apocalyptic number.

It is an amenable number.

720955909 is a deficient number, since it is larger than the sum of its proper divisors (1).

720955909 is an equidigital number, since it uses as much as digits as its factorization.

720955909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 255150, while the sum is 46.

The square root of 720955909 is about 26850.6221343193. The cubic root of 720955909 is about 896.6774234524.

The spelling of 720955909 in words is "seven hundred twenty million, nine hundred fifty-five thousand, nine hundred nine".