81875 has 10 divisors (see below), whose sum is σ = 103092. Its totient is φ = 65000.

The previous prime is 81869. The next prime is 81883. The reversal of 81875 is 57818.

It is a happy number.

It is not a de Polignac number, because 81875 - 2⁸ = 81619 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81875.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 560 + ... + 690.

2⁸¹⁸⁷⁵ is an apocalyptic number.

81875 is a deficient number, since it is larger than the sum of its proper divisors (21217).

81875 is an equidigital number, since it uses as much as digits as its factorization.

81875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 136 counting only the distinct ones).

The product of its digits is 2240, while the sum is 29.

The square root of 81875 is about 286.1380785565. The cubic root of 81875 is about 43.4227280136.

It can be divided in two parts, 8187 and 5, that added together give a 13-th power (8192 = 2¹³).

The spelling of 81875 in words is "eighty-one thousand, eight hundred seventy-five".