81715 has 8 divisors (see below), whose sum is σ = 100080. Its totient is φ = 64032.

The previous prime is 81707. The next prime is 81727. The reversal of 81715 is 51718.

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

It is a cyclic number.

It is not a de Polignac number, because 81715 - 2³ = 81707 is a prime.

81715 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157 + ... + 433.

It is an arithmetic number, because the mean of its divisors is an integer number (12510).

2⁸¹⁷¹⁵ is an apocalyptic number.

81715 is a deficient number, since it is larger than the sum of its proper divisors (18365).

81715 is a wasteful number, since it uses less digits than its factorization.

81715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341.

The product of its digits is 280, while the sum is 22.

The square root of 81715 is about 285.8583565334. The cubic root of 81715 is about 43.3944240254.

The spelling of 81715 in words is "eighty-one thousand, seven hundred fifteen".