86991981117 has 16 divisors (see below), whose sum is σ = 119016777600. Its totient is φ = 56485644800.

The previous prime is 86991981101. The next prime is 86991981121. The reversal of 86991981117 is 71118919968.

It is a cyclic number.

It is not a de Polignac number, because 86991981117 - 2⁴ = 86991981101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86991981187) 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 15 ways as a sum of consecutive naturals, for example, 516684 + ... + 664037.

It is an arithmetic number, because the mean of its divisors is an integer number (7438548600).

Almost surely, 2^86991981117 is an apocalyptic number.

It is an amenable number.

86991981117 is a deficient number, since it is larger than the sum of its proper divisors (32024796483).

86991981117 is a wasteful number, since it uses less digits than its factorization.

86991981117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181364.

The product of its digits is 1959552, while the sum is 60.

The spelling of 86991981117 in words is "eighty-six billion, nine hundred ninety-one million, nine hundred eighty-one thousand, one hundred seventeen".