8494021 has 2 divisors, whose sum is σ = 8494022. Its totient is φ = 8494020.

The previous prime is 8494019. The next prime is 8494027. The reversal of 8494021 is 1204948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8468100 + 25921 = 2910^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 8494021 - 2¹ = 8494019 is a prime.

Together with 8494019, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8494027) 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, 4247010 + 4247011.

It is an arithmetic number, because the mean of its divisors is an integer number (4247011).

Almost surely, 2^8494021 is an apocalyptic number.

It is an amenable number.

8494021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8494021 is an equidigital number, since it uses as much as digits as its factorization.

8494021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 8494021 is about 2914.4503770008. The cubic root of 8494021 is about 204.0348924681.

Adding to 8494021 its reverse (1204948), we get a palindrome (9698969).

The spelling of 8494021 in words is "eight million, four hundred ninety-four thousand, twenty-one".