81194289 has 8 divisors (see below), whose sum is σ = 118100832. Its totient is φ = 49208640.

The previous prime is 81194273. The next prime is 81194299. The reversal of 81194289 is 98249118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81194289 - 2⁴ = 81194273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81194289.

It is not an unprimeable number, because it can be changed into a prime (81194299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230184 + ... + 1230249.

It is an arithmetic number, because the mean of its divisors is an integer number (14762604).

Almost surely, 2^81194289 is an apocalyptic number.

It is an amenable number.

81194289 is a deficient number, since it is larger than the sum of its proper divisors (36906543).

81194289 is a wasteful number, since it uses less digits than its factorization.

81194289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460447.

The product of its digits is 41472, while the sum is 42.

The square root of 81194289 is about 9010.7873684823. The cubic root of 81194289 is about 433.0205371197.

The spelling of 81194289 in words is "eighty-one million, one hundred ninety-four thousand, two hundred eighty-nine".