8267561 has 2 divisors, whose sum is σ = 8267562. Its totient is φ = 8267560.

The previous prime is 8267549. The next prime is 8267579. The reversal of 8267561 is 1657628.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8265625 + 1936 = 2875^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 8267561 - 2²² = 4073257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8267521) 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, 4133780 + 4133781.

It is an arithmetic number, because the mean of its divisors is an integer number (4133781).

Almost surely, 2^8267561 is an apocalyptic number.

It is an amenable number.

8267561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8267561 is an equidigital number, since it uses as much as digits as its factorization.

8267561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 8267561 is about 2875.3366759390. The cubic root of 8267561 is about 202.2052695584.

The spelling of 8267561 in words is "eight million, two hundred sixty-seven thousand, five hundred sixty-one".