726205321 has 2 divisors, whose sum is σ = 726205322. Its totient is φ = 726205320.

The previous prime is 726205283. The next prime is 726205339. The reversal of 726205321 is 123502627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 723610000 + 2595321 = 26900^2 + 1611^2 .

It is an emirp because it is prime and its reverse (123502627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 726205321 - 2¹⁷ = 726074249 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 726205321.

It is not a weakly prime, because it can be changed into another prime (726205351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363102660 + 363102661.

It is an arithmetic number, because the mean of its divisors is an integer number (363102661).

Almost surely, 2^726205321 is an apocalyptic number.

It is an amenable number.

726205321 is a deficient number, since it is larger than the sum of its proper divisors (1).

726205321 is an equidigital number, since it uses as much as digits as its factorization.

726205321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 726205321 is about 26948.1969897802. The cubic root of 726205321 is about 898.8484535668.

Adding to 726205321 its reverse (123502627), we get a palindrome (849707948).

The spelling of 726205321 in words is "seven hundred twenty-six million, two hundred five thousand, three hundred twenty-one".