7218371 has 2 divisors, whose sum is σ = 7218372. Its totient is φ = 7218370.

The previous prime is 7218349. The next prime is 7218391. The reversal of 7218371 is 1738127.

7218371 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (1738127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7218371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7218311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3609185 + 3609186.

It is an arithmetic number, because the mean of its divisors is an integer number (3609186).

Almost surely, 2^7218371 is an apocalyptic number.

7218371 is a deficient number, since it is larger than the sum of its proper divisors (1).

7218371 is an equidigital number, since it uses as much as digits as its factorization.

7218371 is an odious number, because the sum of its binary digits is odd.

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

The square root of 7218371 is about 2686.7026258967. The cubic root of 7218371 is about 193.2619689706.

The spelling of 7218371 in words is "seven million, two hundred eighteen thousand, three hundred seventy-one".