721711241 has 2 divisors, whose sum is σ = 721711242. Its totient is φ = 721711240.

The previous prime is 721711231. The next prime is 721711261. The reversal of 721711241 is 142117127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604963216 + 116748025 = 24596^2 + 10805^2 .

It is a cyclic number.

It is not a de Polignac number, because 721711241 - 2¹⁸ = 721449097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721711241.

It is not a weakly prime, because it can be changed into another prime (721711231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360855620 + 360855621.

It is an arithmetic number, because the mean of its divisors is an integer number (360855621).

Almost surely, 2^721711241 is an apocalyptic number.

It is an amenable number.

721711241 is a deficient number, since it is larger than the sum of its proper divisors (1).

721711241 is an equidigital number, since it uses as much as digits as its factorization.

721711241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 26.

The square root of 721711241 is about 26864.6838991267. The cubic root of 721711241 is about 896.9904582039.

Adding to 721711241 its reverse (142117127), we get a palindrome (863828368).

The spelling of 721711241 in words is "seven hundred twenty-one million, seven hundred eleven thousand, two hundred forty-one".