86864311391 has 24 divisors (see below), whose sum is σ = 106140435072. Its totient is φ = 70541697600.

The previous prime is 86864311357. The next prime is 86864311421. The reversal of 86864311391 is 19311346868.

It is not a de Polignac number, because 86864311391 - 2³⁰ = 85790569567 is a prime.

It is a super-2 number, since 2×86864311391² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86864311351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841916 + ... + 939441.

It is an arithmetic number, because the mean of its divisors is an integer number (4422518128).

Almost surely, 2^86864311391 is an apocalyptic number.

86864311391 is a deficient number, since it is larger than the sum of its proper divisors (19276123681).

86864311391 is a wasteful number, since it uses less digits than its factorization.

86864311391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781423 (or 1781412 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The spelling of 86864311391 in words is "eighty-six billion, eight hundred sixty-four million, three hundred eleven thousand, three hundred ninety-one".