7228391 has 2 divisors, whose sum is σ = 7228392. Its totient is φ = 7228390.

The previous prime is 7228373. The next prime is 7228393. The reversal of 7228391 is 1938227.

It is a strong prime.

It is an emirp because it is prime and its reverse (1938227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7228391 is a prime.

Together with 7228393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7228393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3614195 + 3614196.

It is an arithmetic number, because the mean of its divisors is an integer number (3614196).

Almost surely, 2^7228391 is an apocalyptic number.

7228391 is a deficient number, since it is larger than the sum of its proper divisors (1).

7228391 is an equidigital number, since it uses as much as digits as its factorization.

7228391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 7228391 is about 2688.5667185324. The cubic root of 7228391 is about 193.3513515378.

The spelling of 7228391 in words is "seven million, two hundred twenty-eight thousand, three hundred ninety-one".