81085196 has 6 divisors (see below), whose sum is σ = 141899100. Its totient is φ = 40542596.

The previous prime is 81085187. The next prime is 81085211. The reversal of 81085196 is 69158018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10135646 + ... + 10135653.

It is an arithmetic number, because the mean of its divisors is an integer number (23649850).

Almost surely, 2^81085196 is an apocalyptic number.

It is an amenable number.

81085196 is a deficient number, since it is larger than the sum of its proper divisors (60813904).

81085196 is a wasteful number, since it uses less digits than its factorization.

81085196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20271303 (or 20271301 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 81085196 is about 9004.7318671907. The cubic root of 81085196 is about 432.8265141044.

The spelling of 81085196 in words is "eighty-one million, eighty-five thousand, one hundred ninety-six".