81481134 has 32 divisors (see below), whose sum is σ = 194342400. Its totient is φ = 22267872.

The previous prime is 81481133. The next prime is 81481151. The reversal of 81481134 is 43118418.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81481133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41209 + ... + 43140.

It is an arithmetic number, because the mean of its divisors is an integer number (6073200).

Almost surely, 2^81481134 is an apocalyptic number.

81481134 is an abundant number, since it is smaller than the sum of its proper divisors (112861266).

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

81481134 is a wasteful number, since it uses less digits than its factorization.

81481134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84384.

The product of its digits is 3072, while the sum is 30.

The square root of 81481134 is about 9026.6900910577. The cubic root of 81481134 is about 433.5298660128.

The spelling of 81481134 in words is "eighty-one million, four hundred eighty-one thousand, one hundred thirty-four".