718221085 has 8 divisors (see below), whose sum is σ = 873672120. Its totient is φ = 566705664.

The previous prime is 718221079. The next prime is 718221089. The reversal of 718221085 is 580122817.

It can be written as a sum of positive squares in 4 ways, for example, as 90668484 + 627552601 = 9522^2 + 25051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 718221085 - 2¹¹ = 718219037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 718221085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718221089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 983500 + ... + 984229.

It is an arithmetic number, because the mean of its divisors is an integer number (109209015).

Almost surely, 2^718221085 is an apocalyptic number.

It is an amenable number.

718221085 is a deficient number, since it is larger than the sum of its proper divisors (155451035).

718221085 is a wasteful number, since it uses less digits than its factorization.

718221085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967807.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 718221085 is about 26799.6471058856. The cubic root of 718221085 is about 895.5421888765.

The spelling of 718221085 in words is "seven hundred eighteen million, two hundred twenty-one thousand, eighty-five".