864523531 has 2 divisors, whose sum is σ = 864523532. Its totient is φ = 864523530.

The previous prime is 864523507. The next prime is 864523547. The reversal of 864523531 is 135325468.

864523531 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 864523531 - 2²¹ = 862426379 is a prime.

It is a super-2 number, since 2×864523531² = 1494801871305415922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (864523571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432261765 + 432261766.

It is an arithmetic number, because the mean of its divisors is an integer number (432261766).

Almost surely, 2^864523531 is an apocalyptic number.

864523531 is a deficient number, since it is larger than the sum of its proper divisors (1).

864523531 is an equidigital number, since it uses as much as digits as its factorization.

864523531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 37.

The square root of 864523531 is about 29402.7810079251. The cubic root of 864523531 is about 952.6329658709.

Adding to 864523531 its reverse (135325468), we get a palindrome (999848999).

The spelling of 864523531 in words is "eight hundred sixty-four million, five hundred twenty-three thousand, five hundred thirty-one".