7218697 has 2 divisors, whose sum is σ = 7218698. Its totient is φ = 7218696.

The previous prime is 7218677. The next prime is 7218713. The reversal of 7218697 is 7968127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7096896 + 121801 = 2664^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 7218697 - 2⁷ = 7218569 is a prime.

It is a Chen prime.

7218697 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7218637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3609348 + 3609349.

It is an arithmetic number, because the mean of its divisors is an integer number (3609349).

Almost surely, 2^7218697 is an apocalyptic number.

It is an amenable number.

7218697 is a deficient number, since it is larger than the sum of its proper divisors (1).

7218697 is an equidigital number, since it uses as much as digits as its factorization.

7218697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 7218697 is about 2686.7632943749. The cubic root of 7218697 is about 193.2648783276.

It can be divided in two parts, 72 and 18697, that added together give a square (18769 = 137²).

The spelling of 7218697 in words is "seven million, two hundred eighteen thousand, six hundred ninety-seven".