81179 has 4 divisors (see below), whose sum is σ = 92784. Its totient is φ = 69576.

The previous prime is 81173. The next prime is 81181. The reversal of 81179 is 97118.

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 81179 - 2⁴ = 81163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5792 + ... + 5805.

It is an arithmetic number, because the mean of its divisors is an integer number (23196).

2⁸¹¹⁷⁹ is an apocalyptic number.

81179 is a deficient number, since it is larger than the sum of its proper divisors (11605).

81179 is a wasteful number, since it uses less digits than its factorization.

81179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11604.

The product of its digits is 504, while the sum is 26.

The square root of 81179 is about 284.9192868165. The cubic root of 81179 is about 43.2993355953.

The spelling of 81179 in words is "eighty-one thousand, one hundred seventy-nine".