8091521 has 2 divisors, whose sum is σ = 8091522. Its totient is φ = 8091520.

The previous prime is 8091509. The next prime is 8091529. The reversal of 8091521 is 1251908.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8065600 + 25921 = 2840^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 8091521 - 2¹⁰ = 8090497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8091529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4045760 + 4045761.

It is an arithmetic number, because the mean of its divisors is an integer number (4045761).

Almost surely, 2^8091521 is an apocalyptic number.

It is an amenable number.

8091521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8091521 is an equidigital number, since it uses as much as digits as its factorization.

8091521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 8091521 is about 2844.5598956605. The cubic root of 8091521 is about 200.7597849789.

The spelling of 8091521 in words is "eight million, ninety-one thousand, five hundred twenty-one".