81079 has 4 divisors (see below), whose sum is σ = 82080. Its totient is φ = 80080.

The previous prime is 81077. The next prime is 81083. The reversal of 81079 is 97018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81079 - 2¹ = 81077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81071) 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, 367 + ... + 544.

It is an arithmetic number, because the mean of its divisors is an integer number (20520).

2⁸¹⁰⁷⁹ is an apocalyptic number.

81079 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

81079 is a deficient number, since it is larger than the sum of its proper divisors (1001).

81079 is an equidigital number, since it uses as much as digits as its factorization.

81079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 81079 is about 284.7437444440. The cubic root of 81079 is about 43.2815489234.

The spelling of 81079 in words is "eighty-one thousand, seventy-nine".