9871217 has 2 divisors, whose sum is σ = 9871218. Its totient is φ = 9871216.

The previous prime is 9871189. The next prime is 9871219. The reversal of 9871217 is 7121789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6370576 + 3500641 = 2524^2 + 1871^2 .

It is a cyclic number.

It is not a de Polignac number, because 9871217 - 2⁸ = 9870961 is a prime.

It is a super-2 number, since 2×9871217² = 194881850122178, which contains 22 as substring.

Together with 9871219, 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 (9871219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4935608 + 4935609.

It is an arithmetic number, because the mean of its divisors is an integer number (4935609).

Almost surely, 2^9871217 is an apocalyptic number.

It is an amenable number.

9871217 is a deficient number, since it is larger than the sum of its proper divisors (1).

9871217 is an equidigital number, since it uses as much as digits as its factorization.

9871217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 35.

The square root of 9871217 is about 3141.8492961948. The cubic root of 9871217 is about 214.5146216508.

The spelling of 9871217 in words is "nine million, eight hundred seventy-one thousand, two hundred seventeen".