720555229 has 2 divisors, whose sum is σ = 720555230. Its totient is φ = 720555228.

The previous prime is 720555223. The next prime is 720555301. The reversal of 720555229 is 922555027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596678329 + 123876900 = 24427^2 + 11130^2 .

It is an emirp because it is prime and its reverse (922555027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720555229 - 2⁹ = 720554717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720555223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360277614 + 360277615.

It is an arithmetic number, because the mean of its divisors is an integer number (360277615).

Almost surely, 2^720555229 is an apocalyptic number.

It is an amenable number.

720555229 is a deficient number, since it is larger than the sum of its proper divisors (1).

720555229 is an equidigital number, since it uses as much as digits as its factorization.

720555229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 720555229 is about 26843.1598177264. The cubic root of 720555229 is about 896.5112795480.

It can be divided in two parts, 72055 and 5229, that added together give a square (77284 = 278²).

The spelling of 720555229 in words is "seven hundred twenty million, five hundred fifty-five thousand, two hundred twenty-nine".