86781117 has 4 divisors (see below), whose sum is σ = 115708160. Its totient is φ = 57854076.

The previous prime is 86781109. The next prime is 86781127. The reversal of 86781117 is 71118768.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 86781117 - 2³ = 86781109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86781127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14463517 + ... + 14463522.

It is an arithmetic number, because the mean of its divisors is an integer number (28927040).

Almost surely, 2^86781117 is an apocalyptic number.

It is an amenable number.

86781117 is a deficient number, since it is larger than the sum of its proper divisors (28927043).

86781117 is a wasteful number, since it uses less digits than its factorization.

86781117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28927042.

The product of its digits is 18816, while the sum is 39.

The square root of 86781117 is about 9315.6383034122. The cubic root of 86781117 is about 442.7328481813.

The spelling of 86781117 in words is "eighty-six million, seven hundred eighty-one thousand, one hundred seventeen".