8916521 has 2 divisors, whose sum is σ = 8916522. Its totient is φ = 8916520.

The previous prime is 8916503. The next prime is 8916539. The reversal of 8916521 is 1256198.

It is a balanced prime because it is at equal distance from previous prime (8916503) and next prime (8916539).

It can be written as a sum of positive squares in only one way, i.e., 8202496 + 714025 = 2864^2 + 845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8916521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8916541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4458260 + 4458261.

It is an arithmetic number, because the mean of its divisors is an integer number (4458261).

Almost surely, 2^8916521 is an apocalyptic number.

It is an amenable number.

8916521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8916521 is an equidigital number, since it uses as much as digits as its factorization.

8916521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 8916521 is about 2986.0544201337. The cubic root of 8916521 is about 207.3632601786.

The spelling of 8916521 in words is "eight million, nine hundred sixteen thousand, five hundred twenty-one".