722161217 has 4 divisors (see below), whose sum is σ = 729606276. Its totient is φ = 714716160.

The previous prime is 722161183. The next prime is 722161247. The reversal of 722161217 is 712161227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712161227 = 43 ⋅16561889.

It can be written as a sum of positive squares in 2 ways, for example, as 458131216 + 264030001 = 21404^2 + 16249^2 .

It is a cyclic number.

It is not a de Polignac number, because 722161217 - 2¹⁰ = 722160193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722161217.

It is not an unprimeable number, because it can be changed into a prime (722161247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3722384 + ... + 3722577.

It is an arithmetic number, because the mean of its divisors is an integer number (182401569).

Almost surely, 2^722161217 is an apocalyptic number.

It is an amenable number.

722161217 is a deficient number, since it is larger than the sum of its proper divisors (7445059).

722161217 is an equidigital number, since it uses as much as digits as its factorization.

722161217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7445058.

The product of its digits is 2352, while the sum is 29.

The square root of 722161217 is about 26873.0574553771. The cubic root of 722161217 is about 897.1768394508.

The spelling of 722161217 in words is "seven hundred twenty-two million, one hundred sixty-one thousand, two hundred seventeen".