8179021 has 2 divisors, whose sum is σ = 8179022. Its totient is φ = 8179020.

The previous prime is 8179019. The next prime is 8179079. The reversal of 8179021 is 1209718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4515625 + 3663396 = 2125^2 + 1914^2 .

It is a cyclic number.

It is not a de Polignac number, because 8179021 - 2¹ = 8179019 is a prime.

Together with 8179019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8179001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4089510 + 4089511.

It is an arithmetic number, because the mean of its divisors is an integer number (4089511).

Almost surely, 2^8179021 is an apocalyptic number.

It is an amenable number.

8179021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8179021 is an equidigital number, since it uses as much as digits as its factorization.

8179021 is an evil number, because the sum of its binary digits is even.

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

The square root of 8179021 is about 2859.8987744324. The cubic root of 8179021 is about 201.4808500212.

The spelling of 8179021 in words is "eight million, one hundred seventy-nine thousand, twenty-one".