7971217 has 2 divisors, whose sum is σ = 7971218. Its totient is φ = 7971216.

The previous prime is 7971209. The next prime is 7971221. The reversal of 7971217 is 7121797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6330256 + 1640961 = 2516^2 + 1281^2 .

It is a cyclic number.

It is not a de Polignac number, because 7971217 - 2³ = 7971209 is a prime.

It is a super-2 number, since 2×7971217² = 127080600922178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7971017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3985608 + 3985609.

It is an arithmetic number, because the mean of its divisors is an integer number (3985609).

Almost surely, 2^7971217 is an apocalyptic number.

It is an amenable number.

7971217 is a deficient number, since it is larger than the sum of its proper divisors (1).

7971217 is an equidigital number, since it uses as much as digits as its factorization.

7971217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6174, while the sum is 34.

The square root of 7971217 is about 2823.3343762296. The cubic root of 7971217 is about 199.7598534302.

The spelling of 7971217 in words is "seven million, nine hundred seventy-one thousand, two hundred seventeen".