81725 has 12 divisors (see below), whose sum is σ = 116064. Its totient is φ = 55920.

The previous prime is 81707. The next prime is 81727. The reversal of 81725 is 52718.

It is not a de Polignac number, because 81725 - 2¹⁰ = 80701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59 + ... + 408.

It is an arithmetic number, because the mean of its divisors is an integer number (9672).

2⁸¹⁷²⁵ is an apocalyptic number.

It is an amenable number.

81725 is a deficient number, since it is larger than the sum of its proper divisors (34339).

81725 is a wasteful number, since it uses less digits than its factorization.

81725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 479 counting only the distinct ones).

The product of its digits is 560, while the sum is 23.

The square root of 81725 is about 285.8758471785. The cubic root of 81725 is about 43.3961941066.

The spelling of 81725 in words is "eighty-one thousand, seven hundred twenty-five".