81342717 has 8 divisors (see below), whose sum is σ = 108498624. Its totient is φ = 54207648.

The previous prime is 81342691. The next prime is 81342719. The reversal of 81342717 is 71724318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81342717 - 2⁷ = 81342589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81342719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12688 + ... + 17990.

It is an arithmetic number, because the mean of its divisors is an integer number (13562328).

Almost surely, 2^81342717 is an apocalyptic number.

It is an amenable number.

81342717 is a deficient number, since it is larger than the sum of its proper divisors (27155907).

81342717 is a wasteful number, since it uses less digits than its factorization.

81342717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10419.

The product of its digits is 9408, while the sum is 33.

The square root of 81342717 is about 9019.0197360911. The cubic root of 81342717 is about 433.2842389483.

The spelling of 81342717 in words is "eighty-one million, three hundred forty-two thousand, seven hundred seventeen".