8917021 has 2 divisors, whose sum is σ = 8917022. Its totient is φ = 8917020.

The previous prime is 8917009. The next prime is 8917033. The reversal of 8917021 is 1207198.

It is a balanced prime because it is at equal distance from previous prime (8917009) and next prime (8917033).

It can be written as a sum of positive squares in only one way, i.e., 6996025 + 1920996 = 2645^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 8917021 - 2²³ = 528413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8917001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4458510 + 4458511.

It is an arithmetic number, because the mean of its divisors is an integer number (4458511).

Almost surely, 2^8917021 is an apocalyptic number.

It is an amenable number.

8917021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8917021 is an equidigital number, since it uses as much as digits as its factorization.

8917021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 8917021 is about 2986.1381414797. The cubic root of 8917021 is about 207.3671361182.

The spelling of 8917021 in words is "eight million, nine hundred seventeen thousand, twenty-one".