8261521 has 2 divisors, whose sum is σ = 8261522. Its totient is φ = 8261520.

The previous prime is 8261509. The next prime is 8261551. The reversal of 8261521 is 1251628.

8261521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7075600 + 1185921 = 2660^2 + 1089^2 .

It is a cyclic number.

It is not a de Polignac number, because 8261521 - 2¹⁷ = 8130449 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8261501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4130760 + 4130761.

It is an arithmetic number, because the mean of its divisors is an integer number (4130761).

Almost surely, 2^8261521 is an apocalyptic number.

It is an amenable number.

8261521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8261521 is an equidigital number, since it uses as much as digits as its factorization.

8261521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 25.

The square root of 8261521 is about 2874.2861722522. The cubic root of 8261521 is about 202.1560161221.

The spelling of 8261521 in words is "eight million, two hundred sixty-one thousand, five hundred twenty-one".