81935 has 8 divisors (see below), whose sum is σ = 112416. Its totient is φ = 56160.

The previous prime is 81931. The next prime is 81937. The reversal of 81935 is 53918.

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

It is not a de Polignac number, because 81935 - 2² = 81931 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81931) 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, 1136 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (14052).

2⁸¹⁹³⁵ is an apocalyptic number.

81935 is a deficient number, since it is larger than the sum of its proper divisors (30481).

81935 is a wasteful number, since it uses less digits than its factorization.

81935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353.

The product of its digits is 1080, while the sum is 26.

The square root of 81935 is about 286.2429038422. The cubic root of 81935 is about 43.4333325022.

The spelling of 81935 in words is "eighty-one thousand, nine hundred thirty-five".