7292221 has 2 divisors, whose sum is σ = 7292222. Its totient is φ = 7292220.

The previous prime is 7292203. The next prime is 7292227. The reversal of 7292221 is 1222927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4687225 + 2604996 = 2165^2 + 1614^2 .

It is a cyclic number.

It is not a de Polignac number, because 7292221 - 2⁷ = 7292093 is a prime.

It is a super-2 number, since 2×7292221² = 106352974225682, which contains 22 as substring.

7292221 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7292227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3646110 + 3646111.

It is an arithmetic number, because the mean of its divisors is an integer number (3646111).

Almost surely, 2^7292221 is an apocalyptic number.

It is an amenable number.

7292221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7292221 is an equidigital number, since it uses as much as digits as its factorization.

7292221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 7292221 is about 2700.4112649743. The cubic root of 7292221 is about 193.9188114592.

The spelling of 7292221 in words is "seven million, two hundred ninety-two thousand, two hundred twenty-one".