81135794 has 16 divisors (see below), whose sum is σ = 127785600. Its totient is φ = 38582544.

The previous prime is 81135779. The next prime is 81135799. The reversal of 81135794 is 49753118.

It is not an unprimeable number, because it can be changed into a prime (81135799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6554 + ... + 14325.

It is an arithmetic number, because the mean of its divisors is an integer number (7986600).

Almost surely, 2^81135794 is an apocalyptic number.

81135794 is a deficient number, since it is larger than the sum of its proper divisors (46649806).

81135794 is a wasteful number, since it uses less digits than its factorization.

81135794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20977.

The product of its digits is 30240, while the sum is 38.

The square root of 81135794 is about 9007.5409518914. The cubic root of 81135794 is about 432.9165247899.

The spelling of 81135794 in words is "eighty-one million, one hundred thirty-five thousand, seven hundred ninety-four".