81895 has 8 divisors (see below), whose sum is σ = 107280. Its totient is φ = 59520.

The previous prime is 81883. The next prime is 81899. The reversal of 81895 is 59818.

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

It is not a de Polignac number, because 81895 - 2¹¹ = 79847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690 + ... + 799.

It is an arithmetic number, because the mean of its divisors is an integer number (13410).

2⁸¹⁸⁹⁵ is an apocalyptic number.

81895 is a deficient number, since it is larger than the sum of its proper divisors (25385).

81895 is a wasteful number, since it uses less digits than its factorization.

81895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505.

The product of its digits is 2880, while the sum is 31.

The square root of 81895 is about 286.1730245848. The cubic root of 81895 is about 43.4262634186.

The spelling of 81895 in words is "eighty-one thousand, eight hundred ninety-five".