81594081 has 16 divisors (see below), whose sum is σ = 125049600. Its totient is φ = 52519824.

The previous prime is 81594053. The next prime is 81594089. The reversal of 81594081 is 18049518.

It is not a de Polignac number, because 81594081 - 2⁶ = 81594017 is a prime.

It is a super-2 number, since 2×81594081² = 13315188108469122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81594089) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 51321 + ... + 52886.

It is an arithmetic number, because the mean of its divisors is an integer number (7815600).

Almost surely, 2^81594081 is an apocalyptic number.

It is an amenable number.

81594081 is a deficient number, since it is larger than the sum of its proper divisors (43455519).

81594081 is a wasteful number, since it uses less digits than its factorization.

81594081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104245 (or 104239 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 81594081 is about 9032.9442044109. The cubic root of 81594081 is about 433.7300894171.

The spelling of 81594081 in words is "eighty-one million, five hundred ninety-four thousand, eighty-one".