8725217 has 2 divisors, whose sum is σ = 8725218. Its totient is φ = 8725216.

The previous prime is 8725207. The next prime is 8725219. The reversal of 8725217 is 7125278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8667136 + 58081 = 2944^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 8725217 - 2⁶ = 8725153 is a prime.

It is a super-2 number, since 2×8725217² = 152258823394178, which contains 22 as substring.

Together with 8725219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8725219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4362608 + 4362609.

It is an arithmetic number, because the mean of its divisors is an integer number (4362609).

Almost surely, 2^8725217 is an apocalyptic number.

It is an amenable number.

8725217 is a deficient number, since it is larger than the sum of its proper divisors (1).

8725217 is an equidigital number, since it uses as much as digits as its factorization.

8725217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 32.

The square root of 8725217 is about 2953.8478295268. The cubic root of 8725217 is about 205.8695328088.

The spelling of 8725217 in words is "eight million, seven hundred twenty-five thousand, two hundred seventeen".