864425531 has 2 divisors, whose sum is σ = 864425532. Its totient is φ = 864425530.

The previous prime is 864425459. The next prime is 864425593. The reversal of 864425531 is 135524468.

864425531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864425531 - 2¹⁰ = 864424507 is a prime.

It is a super-2 number, since 2×864425531² = 1494462997289263922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (864425831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432212765 + 432212766.

It is an arithmetic number, because the mean of its divisors is an integer number (432212766).

Almost surely, 2^864425531 is an apocalyptic number.

864425531 is a deficient number, since it is larger than the sum of its proper divisors (1).

864425531 is an equidigital number, since it uses as much as digits as its factorization.

864425531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 38.

The square root of 864425531 is about 29401.1144516666. The cubic root of 864425531 is about 952.5969685633.

Adding to 864425531 its reverse (135524468), we get a palindrome (999949999).

The spelling of 864425531 in words is "eight hundred sixty-four million, four hundred twenty-five thousand, five hundred thirty-one".