7217081 has 2 divisors, whose sum is σ = 7217082. Its totient is φ = 7217080.

The previous prime is 7217071. The next prime is 7217123. The reversal of 7217081 is 1807127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7203856 + 13225 = 2684^2 + 115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7217081 is a prime.

It is a super-2 number, since 2×7217081² = 104172516321122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7217081.

It is not a weakly prime, because it can be changed into another prime (7217071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3608540 + 3608541.

It is an arithmetic number, because the mean of its divisors is an integer number (3608541).

Almost surely, 2^7217081 is an apocalyptic number.

It is an amenable number.

7217081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7217081 is an equidigital number, since it uses as much as digits as its factorization.

7217081 is an odious number, because the sum of its binary digits is odd.

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

The square root of 7217081 is about 2686.4625439414. The cubic root of 7217081 is about 193.2504556253.

The spelling of 7217081 in words is "seven million, two hundred seventeen thousand, eighty-one".