86649239 has 2 divisors, whose sum is σ = 86649240. Its totient is φ = 86649238.

The previous prime is 86649217. The next prime is 86649271. The reversal of 86649239 is 93294668.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86649239 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 86649193 and 86649202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86649209) 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, 43324619 + 43324620.

It is an arithmetic number, because the mean of its divisors is an integer number (43324620).

Almost surely, 2^86649239 is an apocalyptic number.

86649239 is a deficient number, since it is larger than the sum of its proper divisors (1).

86649239 is an equidigital number, since it uses as much as digits as its factorization.

86649239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 47.

The square root of 86649239 is about 9308.5572996034. The cubic root of 86649239 is about 442.5084663281.

It can be divided in two parts, 866 and 49239, that added together give a palindrome (50105).

The spelling of 86649239 in words is "eighty-six million, six hundred forty-nine thousand, two hundred thirty-nine".