86421539 has 2 divisors, whose sum is σ = 86421540. Its totient is φ = 86421538.

The previous prime is 86421493. The next prime is 86421541. The reversal of 86421539 is 93512468.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86421539 is a prime.

Together with 86421541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86421589) 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, 43210769 + 43210770.

It is an arithmetic number, because the mean of its divisors is an integer number (43210770).

Almost surely, 2^86421539 is an apocalyptic number.

86421539 is a deficient number, since it is larger than the sum of its proper divisors (1).

86421539 is an equidigital number, since it uses as much as digits as its factorization.

86421539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 86421539 is about 9296.3185724242. The cubic root of 86421539 is about 442.1205130598.

The spelling of 86421539 in words is "eighty-six million, four hundred twenty-one thousand, five hundred thirty-nine".