8198521 has 2 divisors, whose sum is σ = 8198522. Its totient is φ = 8198520.

The previous prime is 8198507. The next prime is 8198551. The reversal of 8198521 is 1258918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4682896 + 3515625 = 2164^2 + 1875^2 .

It is a cyclic number.

It is not a de Polignac number, because 8198521 - 2⁹ = 8198009 is a prime.

It is not a weakly prime, because it can be changed into another prime (8198501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4099260 + 4099261.

It is an arithmetic number, because the mean of its divisors is an integer number (4099261).

Almost surely, 2^8198521 is an apocalyptic number.

It is an amenable number.

8198521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8198521 is an equidigital number, since it uses as much as digits as its factorization.

8198521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 34.

The square root of 8198521 is about 2863.3059564077. The cubic root of 8198521 is about 201.6408430230.

The spelling of 8198521 in words is "eight million, one hundred ninety-eight thousand, five hundred twenty-one".