81185596 has 12 divisors (see below), whose sum is σ = 142159752. Its totient is φ = 40568528.

The previous prime is 81185581. The next prime is 81185597. The reversal of 81185596 is 69558118.

It is a super-2 number, since 2×81185596² = 13182201995750432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81185597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2946 + ... + 13078.

It is an arithmetic number, because the mean of its divisors is an integer number (11846646).

Almost surely, 2^81185596 is an apocalyptic number.

It is an amenable number.

81185596 is a deficient number, since it is larger than the sum of its proper divisors (60974156).

81185596 is a wasteful number, since it uses less digits than its factorization.

81185596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12140 (or 12138 counting only the distinct ones).

The product of its digits is 86400, while the sum is 43.

The square root of 81185596 is about 9010.3049892887. The cubic root of 81185596 is about 433.0050829052.

The spelling of 81185596 in words is "eighty-one million, one hundred eighty-five thousand, five hundred ninety-six".