81193 has 6 divisors (see below), whose sum is σ = 94506. Its totient is φ = 69552.

The previous prime is 81181. The next prime is 81197. The reversal of 81193 is 39118.

81193 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in only one way, i.e., 63504 + 17689 = 252^2 + 133^2 .

It is not a de Polignac number, because 81193 - 2⁹ = 80681 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (81197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 780 + ... + 877.

It is an arithmetic number, because the mean of its divisors is an integer number (15751).

2⁸¹¹⁹³ is an apocalyptic number.

It is an amenable number.

81193 is a deficient number, since it is larger than the sum of its proper divisors (13313).

81193 is a wasteful number, since it uses less digits than its factorization.

81193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1664 counting only the distinct ones).

The product of its digits is 216, while the sum is 22.

The square root of 81193 is about 284.9438541187. The cubic root of 81193 is about 43.3018245635.

The spelling of 81193 in words is "eighty-one thousand, one hundred ninety-three".