864478591 has 2 divisors, whose sum is σ = 864478592. Its totient is φ = 864478590.

The previous prime is 864478553. The next prime is 864478609. The reversal of 864478591 is 195874468.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864478591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864478541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432239295 + 432239296.

It is an arithmetic number, because the mean of its divisors is an integer number (432239296).

Almost surely, 2^864478591 is an apocalyptic number.

864478591 is a deficient number, since it is larger than the sum of its proper divisors (1).

864478591 is an equidigital number, since it uses as much as digits as its factorization.

864478591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The square root of 864478591 is about 29402.0167845677. The cubic root of 864478591 is about 952.6164588719.

The spelling of 864478591 in words is "eight hundred sixty-four million, four hundred seventy-eight thousand, five hundred ninety-one".