81854851 has 8 divisors (see below), whose sum is σ = 88694480. Its totient is φ = 75092832.

The previous prime is 81854837. The next prime is 81854867. The reversal of 81854851 is 15845818.

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

It is a cyclic number.

It is not a de Polignac number, because 81854851 - 2¹³ = 81846659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81854891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17196 + ... + 21433.

It is an arithmetic number, because the mean of its divisors is an integer number (11086810).

Almost surely, 2^81854851 is an apocalyptic number.

81854851 is a deficient number, since it is larger than the sum of its proper divisors (6839629).

81854851 is a wasteful number, since it uses less digits than its factorization.

81854851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38805.

The product of its digits is 51200, while the sum is 40.

The square root of 81854851 is about 9047.3670755640. The cubic root of 81854851 is about 434.1916568757.

The spelling of 81854851 in words is "eighty-one million, eight hundred fifty-four thousand, eight hundred fifty-one".