81194718 has 16 divisors (see below), whose sum is σ = 177152256. Its totient is φ = 24604440.

The previous prime is 81194653. The next prime is 81194749. The reversal of 81194718 is 81749118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615046 + ... + 615177.

It is an arithmetic number, because the mean of its divisors is an integer number (11072016).

Almost surely, 2^81194718 is an apocalyptic number.

81194718 is an abundant number, since it is smaller than the sum of its proper divisors (95957538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81194718 is a wasteful number, since it uses less digits than its factorization.

81194718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230239.

The product of its digits is 16128, while the sum is 39.

The square root of 81194718 is about 9010.8111732518. The cubic root of 81194718 is about 433.0212997574.

The spelling of 81194718 in words is "eighty-one million, one hundred ninety-four thousand, seven hundred eighteen".