81597 has 8 divisors (see below), whose sum is σ = 110880. Its totient is φ = 53360.

The previous prime is 81569. The next prime is 81611. The reversal of 81597 is 79518.

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 81597 - 2⁶ = 81533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81517) 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, 54 + ... + 407.

It is an arithmetic number, because the mean of its divisors is an integer number (13860).

2⁸¹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

81597 is a deficient number, since it is larger than the sum of its proper divisors (29283).

81597 is a wasteful number, since it uses less digits than its factorization.

81597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its digits is 2520, while the sum is 30.

The square root of 81597 is about 285.6518860431. The cubic root of 81597 is about 43.3735261537.

The spelling of 81597 in words is "eighty-one thousand, five hundred ninety-seven".