864286561 has 2 divisors, whose sum is σ = 864286562. Its totient is φ = 864286560.

The previous prime is 864286543. The next prime is 864286583. The reversal of 864286561 is 165682468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 448126561 + 416160000 = 21169^2 + 20400^2 .

It is a cyclic number.

It is not a de Polignac number, because 864286561 - 2¹³ = 864278369 is a prime.

It is not a weakly prime, because it can be changed into another prime (864286531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432143280 + 432143281.

It is an arithmetic number, because the mean of its divisors is an integer number (432143281).

Almost surely, 2^864286561 is an apocalyptic number.

It is an amenable number.

864286561 is a deficient number, since it is larger than the sum of its proper divisors (1).

864286561 is an equidigital number, since it uses as much as digits as its factorization.

864286561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 46.

The square root of 864286561 is about 29398.7510108848. The cubic root of 864286561 is about 952.5459175123.

The spelling of 864286561 in words is "eight hundred sixty-four million, two hundred eighty-six thousand, five hundred sixty-one".