864263021 has 2 divisors, whose sum is σ = 864263022. Its totient is φ = 864263020.

The previous prime is 864263003. The next prime is 864263033. The reversal of 864263021 is 120362468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717489796 + 146773225 = 26786^2 + 12115^2 .

It is a cyclic number.

It is not a de Polignac number, because 864263021 - 2²² = 860068717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864263041) 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, 432131510 + 432131511.

It is an arithmetic number, because the mean of its divisors is an integer number (432131511).

Almost surely, 2^864263021 is an apocalyptic number.

It is an amenable number.

864263021 is a deficient number, since it is larger than the sum of its proper divisors (1).

864263021 is an equidigital number, since it uses as much as digits as its factorization.

864263021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 864263021 is about 29398.3506510144. The cubic root of 864263021 is about 952.5372694799.

The spelling of 864263021 in words is "eight hundred sixty-four million, two hundred sixty-three thousand, twenty-one".