722257309 has 2 divisors, whose sum is σ = 722257310. Its totient is φ = 722257308.

The previous prime is 722257259. The next prime is 722257331. The reversal of 722257309 is 903752227.

722257309 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., 431725284 + 290532025 = 20778^2 + 17045^2 .

It is a cyclic number.

It is not a de Polignac number, because 722257309 - 2¹³ = 722249117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722257379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361128654 + 361128655.

It is an arithmetic number, because the mean of its divisors is an integer number (361128655).

Almost surely, 2^722257309 is an apocalyptic number.

It is an amenable number.

722257309 is a deficient number, since it is larger than the sum of its proper divisors (1).

722257309 is an equidigital number, since it uses as much as digits as its factorization.

722257309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 722257309 is about 26874.8452832756. The cubic root of 722257309 is about 897.2166309781.

The spelling of 722257309 in words is "seven hundred twenty-two million, two hundred fifty-seven thousand, three hundred nine".