7275221 has 2 divisors, whose sum is σ = 7275222. Its totient is φ = 7275220.

The previous prime is 7275217. The next prime is 7275227. The reversal of 7275221 is 1225727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6832996 + 442225 = 2614^2 + 665^2 .

It is an emirp because it is prime and its reverse (1225727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7275221 - 2² = 7275217 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7275227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3637610 + 3637611.

It is an arithmetic number, because the mean of its divisors is an integer number (3637611).

Almost surely, 2^7275221 is an apocalyptic number.

It is an amenable number.

7275221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7275221 is an equidigital number, since it uses as much as digits as its factorization.

7275221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 26.

The square root of 7275221 is about 2697.2617596370. The cubic root of 7275221 is about 193.7680030444.

The spelling of 7275221 in words is "seven million, two hundred seventy-five thousand, two hundred twenty-one".