81995914 has 48 divisors (see below), whose sum is σ = 168116256. Its totient is φ = 29484000.

The previous prime is 81995909. The next prime is 81995923. The reversal of 81995914 is 41959918.

It is a congruent number.

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 in 23 ways as a sum of consecutive naturals, for example, 11089 + ... + 16939.

It is an arithmetic number, because the mean of its divisors is an integer number (3502422).

Almost surely, 2^81995914 is an apocalyptic number.

81995914 is an abundant number, since it is smaller than the sum of its proper divisors (86120342).

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

81995914 is a wasteful number, since it uses less digits than its factorization.

81995914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891 (or 5884 counting only the distinct ones).

The product of its digits is 116640, while the sum is 46.

The square root of 81995914 is about 9055.1595237191. The cubic root of 81995914 is about 434.4409323792.

The spelling of 81995914 in words is "eighty-one million, nine hundred ninety-five thousand, nine hundred fourteen".