7722217 has 2 divisors, whose sum is σ = 7722218. Its totient is φ = 7722216.

The previous prime is 7722191. The next prime is 7722229. The reversal of 7722217 is 7122277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4247721 + 3474496 = 2061^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 7722217 - 2¹⁹ = 7197929 is a prime.

It is not a weakly prime, because it can be changed into another prime (7722257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3861108 + 3861109.

It is an arithmetic number, because the mean of its divisors is an integer number (3861109).

Almost surely, 2^7722217 is an apocalyptic number.

It is an amenable number.

7722217 is a deficient number, since it is larger than the sum of its proper divisors (1).

7722217 is an equidigital number, since it uses as much as digits as its factorization.

7722217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2744, while the sum is 28.

The square root of 7722217 is about 2778.8877271311. The cubic root of 7722217 is about 197.6578196967.

The spelling of 7722217 in words is "seven million, seven hundred twenty-two thousand, two hundred seventeen".