81194 has 4 divisors (see below), whose sum is σ = 121794. Its totient is φ = 40596.

The previous prime is 81181. The next prime is 81197. The reversal of 81194 is 49118.

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

It can be written as a sum of positive squares in only one way, i.e., 46225 + 34969 = 215^2 + 187^2 .

It is a Curzon 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 as a sum of consecutive naturals, namely, 20297 + ... + 20300.

2⁸¹¹⁹⁴ is an apocalyptic number.

81194 is a deficient number, since it is larger than the sum of its proper divisors (40600).

81194 is a wasteful number, since it uses less digits than its factorization.

81194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40599.

The product of its digits is 288, while the sum is 23.

The square root of 81194 is about 284.9456088449. The cubic root of 81194 is about 43.3020023360.

The spelling of 81194 in words is "eighty-one thousand, one hundred ninety-four".