8418521 has 2 divisors, whose sum is σ = 8418522. Its totient is φ = 8418520.

The previous prime is 8418511. The next prime is 8418547. The reversal of 8418521 is 1258148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7778521 + 640000 = 2789^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 8418521 - 2⁶ = 8418457 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8418511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4209260 + 4209261.

It is an arithmetic number, because the mean of its divisors is an integer number (4209261).

Almost surely, 2^8418521 is an apocalyptic number.

It is an amenable number.

8418521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8418521 is an equidigital number, since it uses as much as digits as its factorization.

8418521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 29.

The square root of 8418521 is about 2901.4687659873. The cubic root of 8418521 is about 203.4285638904.

The spelling of 8418521 in words is "eight million, four hundred eighteen thousand, five hundred twenty-one".