720566281 has 2 divisors, whose sum is σ = 720566282. Its totient is φ = 720566280.

The previous prime is 720566269. The next prime is 720566293. The reversal of 720566281 is 182665027.

It is a happy number.

720566281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (720566269) and next prime (720566293).

It can be written as a sum of positive squares in only one way, i.e., 598242681 + 122323600 = 24459^2 + 11060^2 .

It is an emirp because it is prime and its reverse (182665027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720566281 - 2¹³ = 720558089 is a prime.

It is a super-2 number, since 2×720566281² = 1038431530628341922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 720566281.

It is not a weakly prime, because it can be changed into another prime (720566261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360283140 + 360283141.

It is an arithmetic number, because the mean of its divisors is an integer number (360283141).

Almost surely, 2^720566281 is an apocalyptic number.

It is an amenable number.

720566281 is a deficient number, since it is larger than the sum of its proper divisors (1).

720566281 is an equidigital number, since it uses as much as digits as its factorization.

720566281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 720566281 is about 26843.3656794374. The cubic root of 720566281 is about 896.5158631393.

The spelling of 720566281 in words is "seven hundred twenty million, five hundred sixty-six thousand, two hundred eighty-one".