81193118 has 8 divisors (see below), whose sum is σ = 128199720. Its totient is φ = 38459880.

The previous prime is 81193117. The next prime is 81193121. The reversal of 81193118 is 81139118.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81193117) 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, 1068293 + ... + 1068368.

It is an arithmetic number, because the mean of its divisors is an integer number (16024965).

Almost surely, 2^81193118 is an apocalyptic number.

81193118 is a deficient number, since it is larger than the sum of its proper divisors (47006602).

81193118 is a wasteful number, since it uses less digits than its factorization.

81193118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136682.

The product of its digits is 1728, while the sum is 32.

The square root of 81193118 is about 9010.7223905745. The cubic root of 81193118 is about 433.0184554073.

The spelling of 81193118 in words is "eighty-one million, one hundred ninety-three thousand, one hundred eighteen".