81854499 has 8 divisors (see below), whose sum is σ = 111677632. Its totient is φ = 53300520.

The previous prime is 81854449. The next prime is 81854537. The reversal of 81854499 is 99445818.

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

It is not a de Polignac number, because 81854499 - 2¹¹ = 81852451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81854429) 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, 317137 + ... + 317394.

It is an arithmetic number, because the mean of its divisors is an integer number (13959704).

Almost surely, 2^81854499 is an apocalyptic number.

81854499 is a deficient number, since it is larger than the sum of its proper divisors (29823133).

81854499 is a wasteful number, since it uses less digits than its factorization.

81854499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634577.

The product of its digits is 414720, while the sum is 48.

The square root of 81854499 is about 9047.3476223698. The cubic root of 81854499 is about 434.1910344907.

The spelling of 81854499 in words is "eighty-one million, eight hundred fifty-four thousand, four hundred ninety-nine".