81141084 has 18 divisors (see below), whose sum is σ = 205106720. Its totient is φ = 27047016.

The previous prime is 81141029. The next prime is 81141089. The reversal of 81141084 is 48014118.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81141089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1126924 + ... + 1126995.

Almost surely, 2^81141084 is an apocalyptic number.

It is an amenable number.

81141084 is an abundant number, since it is smaller than the sum of its proper divisors (123965636).

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

81141084 is a wasteful number, since it uses less digits than its factorization.

81141084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253929 (or 2253924 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 81141084 is about 9007.8345899556. The cubic root of 81141084 is about 432.9259332089.

The spelling of 81141084 in words is "eighty-one million, one hundred forty-one thousand, eighty-four".