81273 has 4 divisors (see below), whose sum is σ = 108368. Its totient is φ = 54180.

The previous prime is 81239. The next prime is 81281. The reversal of 81273 is 37218.

81273 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81273 - 2⁸ = 81017 is a prime.

It is a D-number.

It is a Duffinian number.

81273 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (81203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13543 + ... + 13548.

It is an arithmetic number, because the mean of its divisors is an integer number (27092).

2⁸¹²⁷³ is an apocalyptic number.

It is an amenable number.

81273 is a deficient number, since it is larger than the sum of its proper divisors (27095).

81273 is a wasteful number, since it uses less digits than its factorization.

81273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27094.

The product of its digits is 336, while the sum is 21.

The square root of 81273 is about 285.0841980889. The cubic root of 81273 is about 43.3160417531.

The spelling of 81273 in words is "eighty-one thousand, two hundred seventy-three".