81697 has 8 divisors (see below), whose sum is σ = 101952. Its totient is φ = 63600.

The previous prime is 81689. The next prime is 81701. The reversal of 81697 is 79618.

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 81697 - 2³ = 81689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81637) 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, 454 + ... + 607.

It is an arithmetic number, because the mean of its divisors is an integer number (12744).

2⁸¹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

81697 is a deficient number, since it is larger than the sum of its proper divisors (20255).

81697 is a wasteful number, since it uses less digits than its factorization.

81697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079.

The product of its digits is 3024, while the sum is 31.

The square root of 81697 is about 285.8268706752. The cubic root of 81697 is about 43.3912375154.

The spelling of 81697 in words is "eighty-one thousand, six hundred ninety-seven".