86519999 has 4 divisors (see below), whose sum is σ = 88532136. Its totient is φ = 84507864.

The previous prime is 86519971. The next prime is 86520001. The reversal of 86519999 is 99991568.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86519999 - 2⁸ = 86519743 is a prime.

It is a Duffinian number.

86519999 is a modest number, since divided by 9999 gives 8651 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86519969) 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 in 3 ways as a sum of consecutive naturals, for example, 1006004 + ... + 1006089.

It is an arithmetic number, because the mean of its divisors is an integer number (22133034).

Almost surely, 2^86519999 is an apocalyptic number.

86519999 is a deficient number, since it is larger than the sum of its proper divisors (2012137).

86519999 is a wasteful number, since it uses less digits than its factorization.

86519999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012136.

The product of its digits is 1574640, while the sum is 56.

The square root of 86519999 is about 9301.6127096327. The cubic root of 86519999 is about 442.2883518686.

The spelling of 86519999 in words is "eighty-six million, five hundred nineteen thousand, nine hundred ninety-nine".