81594156 has 96 divisors (see below), whose sum is σ = 229340160. Its totient is φ = 22074624.

The previous prime is 81594143. The next prime is 81594173. The reversal of 81594156 is 65149518.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303190 + ... + 303458.

It is an arithmetic number, because the mean of its divisors is an integer number (2388960).

Almost surely, 2^81594156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81594156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114670080).

81594156 is an abundant number, since it is smaller than the sum of its proper divisors (147746004).

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

81594156 is a wasteful number, since it uses less digits than its factorization.

81594156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 461 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 81594156 is about 9032.9483558803. The cubic root of 81594156 is about 433.7302223097.

The spelling of 81594156 in words is "eighty-one million, five hundred ninety-four thousand, one hundred fifty-six".