81196885 has 16 divisors (see below), whose sum is σ = 121479552. Its totient is φ = 50616000.

The previous prime is 81196873. The next prime is 81196891. The reversal of 81196885 is 58869118.

It is not a de Polignac number, because 81196885 - 2⁵ = 81196853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105066 + ... + 105835.

It is an arithmetic number, because the mean of its divisors is an integer number (7592472).

Almost surely, 2^81196885 is an apocalyptic number.

It is an amenable number.

81196885 is a deficient number, since it is larger than the sum of its proper divisors (40282667).

81196885 is a wasteful number, since it uses less digits than its factorization.

81196885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210924.

The product of its digits is 138240, while the sum is 46.

The square root of 81196885 is about 9010.9314168958. The cubic root of 81196885 is about 433.0251520146.

The spelling of 81196885 in words is "eighty-one million, one hundred ninety-six thousand, eight hundred eighty-five".