722247121 has 2 divisors, whose sum is σ = 722247122. Its totient is φ = 722247120.

The previous prime is 722247101. The next prime is 722247131. The reversal of 722247121 is 121742227.

722247121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586850625 + 135396496 = 24225^2 + 11636^2 .

It is an emirp because it is prime and its reverse (121742227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 722247121 - 2⁵ = 722247089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 722247121.

It is not a weakly prime, because it can be changed into another prime (722247101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361123560 + 361123561.

It is an arithmetic number, because the mean of its divisors is an integer number (361123561).

Almost surely, 2^722247121 is an apocalyptic number.

It is an amenable number.

722247121 is a deficient number, since it is larger than the sum of its proper divisors (1).

722247121 is an equidigital number, since it uses as much as digits as its factorization.

722247121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 28.

The square root of 722247121 is about 26874.6557373299. The cubic root of 722247121 is about 897.2124123126.

Adding to 722247121 its reverse (121742227), we get a palindrome (843989348).

The spelling of 722247121 in words is "seven hundred twenty-two million, two hundred forty-seven thousand, one hundred twenty-one".