81110717 has 4 divisors (see below), whose sum is σ = 81135516. Its totient is φ = 81085920.

The previous prime is 81110699. The next prime is 81110761. The reversal of 81110717 is 71701118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71701118 = 2 ⋅35850559.

It can be written as a sum of positive squares in 2 ways, for example, as 39262756 + 41847961 = 6266^2 + 6469^2 .

It is a cyclic number.

It is not a de Polignac number, because 81110717 - 2⁸ = 81110461 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 (81110797) 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, 6584 + ... + 14337.

It is an arithmetic number, because the mean of its divisors is an integer number (20283879).

Almost surely, 2^81110717 is an apocalyptic number.

It is an amenable number.

81110717 is a deficient number, since it is larger than the sum of its proper divisors (24799).

81110717 is a wasteful number, since it uses less digits than its factorization.

81110717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24798.

The product of its (nonzero) digits is 392, while the sum is 26.

The square root of 81110717 is about 9006.1488439843. The cubic root of 81110717 is about 432.8719190501.

The spelling of 81110717 in words is "eighty-one million, one hundred ten thousand, seven hundred seventeen".