86021539 has 2 divisors, whose sum is σ = 86021540. Its totient is φ = 86021538.

The previous prime is 86021527. The next prime is 86021561. The reversal of 86021539 is 93512068.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86021539 is a prime.

It is not a weakly prime, because it can be changed into another prime (86021839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43010769 + 43010770.

It is an arithmetic number, because the mean of its divisors is an integer number (43010770).

Almost surely, 2^86021539 is an apocalyptic number.

86021539 is a deficient number, since it is larger than the sum of its proper divisors (1).

86021539 is an equidigital number, since it uses as much as digits as its factorization.

86021539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 86021539 is about 9274.7797278426. The cubic root of 86021539 is about 441.4373432662.

The spelling of 86021539 in words is "eighty-six million, twenty-one thousand, five hundred thirty-nine".