81918854 has 8 divisors (see below), whose sum is σ = 122968560. Its totient is φ = 40929336.

The previous prime is 81918829. The next prime is 81918871. The reversal of 81918854 is 45881918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11474 + ... + 17189.

It is an arithmetic number, because the mean of its divisors is an integer number (15371070).

Almost surely, 2^81918854 is an apocalyptic number.

81918854 is a deficient number, since it is larger than the sum of its proper divisors (41049706).

81918854 is a wasteful number, since it uses less digits than its factorization.

81918854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30094.

The product of its digits is 92160, while the sum is 44.

The square root of 81918854 is about 9050.9034908124. The cubic root of 81918854 is about 434.3047934357.

The spelling of 81918854 in words is "eighty-one million, nine hundred eighteen thousand, eight hundred fifty-four".