86978539 has 2 divisors, whose sum is σ = 86978540. Its totient is φ = 86978538.

The previous prime is 86978533. The next prime is 86978581. The reversal of 86978539 is 93587968.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86978539 - 2³ = 86978531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86978539.

It is not a weakly prime, because it can be changed into another prime (86978531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43489269 + 43489270.

It is an arithmetic number, because the mean of its divisors is an integer number (43489270).

Almost surely, 2^86978539 is an apocalyptic number.

86978539 is a deficient number, since it is larger than the sum of its proper divisors (1).

86978539 is an equidigital number, since it uses as much as digits as its factorization.

86978539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The square root of 86978539 is about 9326.2285517780. The cubic root of 86978539 is about 443.0683244171.

The spelling of 86978539 in words is "eighty-six million, nine hundred seventy-eight thousand, five hundred thirty-nine".