864427649 has 2 divisors, whose sum is σ = 864427650. Its totient is φ = 864427648.

The previous prime is 864427643. The next prime is 864427651. The reversal of 864427649 is 946724468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 834921025 + 29506624 = 28895^2 + 5432^2 .

It is a cyclic number.

It is not a de Polignac number, because 864427649 - 2²⁰ = 863379073 is a prime.

Together with 864427651, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 864427597 and 864427606.

It is not a weakly prime, because it can be changed into another prime (864427643) 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, 432213824 + 432213825.

It is an arithmetic number, because the mean of its divisors is an integer number (432213825).

Almost surely, 2^864427649 is an apocalyptic number.

It is an amenable number.

864427649 is a deficient number, since it is larger than the sum of its proper divisors (1).

864427649 is an equidigital number, since it uses as much as digits as its factorization.

864427649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 50.

The square root of 864427649 is about 29401.1504706874. The cubic root of 864427649 is about 952.5977465747.

The spelling of 864427649 in words is "eight hundred sixty-four million, four hundred twenty-seven thousand, six hundred forty-nine".