8543921 has 2 divisors, whose sum is σ = 8543922. Its totient is φ = 8543920.

The previous prime is 8543903. The next prime is 8543957. The reversal of 8543921 is 1293458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7840000 + 703921 = 2800^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 8543921 - 2²² = 4349617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8540921) 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, 4271960 + 4271961.

It is an arithmetic number, because the mean of its divisors is an integer number (4271961).

Almost surely, 2^8543921 is an apocalyptic number.

It is an amenable number.

8543921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8543921 is an equidigital number, since it uses as much as digits as its factorization.

8543921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 8543921 is about 2922.9986315426. The cubic root of 8543921 is about 204.4336619256.

The spelling of 8543921 in words is "eight million, five hundred forty-three thousand, nine hundred twenty-one".