720234217 has 2 divisors, whose sum is σ = 720234218. Its totient is φ = 720234216.

The previous prime is 720234173. The next prime is 720234233. The reversal of 720234217 is 712432027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630060201 + 90174016 = 25101^2 + 9496^2 .

It is a cyclic number.

It is not a de Polignac number, because 720234217 - 2²³ = 711845609 is a prime.

It is not a weakly prime, because it can be changed into another prime (720234287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360117108 + 360117109.

It is an arithmetic number, because the mean of its divisors is an integer number (360117109).

Almost surely, 2^720234217 is an apocalyptic number.

It is an amenable number.

720234217 is a deficient number, since it is larger than the sum of its proper divisors (1).

720234217 is an equidigital number, since it uses as much as digits as its factorization.

720234217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 720234217 is about 26837.1797512332. The cubic root of 720234217 is about 896.3781259208.

The spelling of 720234217 in words is "seven hundred twenty million, two hundred thirty-four thousand, two hundred seventeen".