81493841 has 8 divisors (see below), whose sum is σ = 95741184. Its totient is φ = 68386320.

The previous prime is 81493813. The next prime is 81493843. The reversal of 81493841 is 14839418.

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 81493841 - 2⁶ = 81493777 is a prime.

It is a super-2 number, since 2×81493841² = 13282492241866562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81493795 and 81493804.

It is not an unprimeable number, because it can be changed into a prime (81493843) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 284801 + ... + 285086.

It is an arithmetic number, because the mean of its divisors is an integer number (11967648).

Almost surely, 2^81493841 is an apocalyptic number.

It is an amenable number.

81493841 is a deficient number, since it is larger than the sum of its proper divisors (14247343).

81493841 is a wasteful number, since it uses less digits than its factorization.

81493841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569911.

The product of its digits is 27648, while the sum is 38.

The square root of 81493841 is about 9027.3939207282. The cubic root of 81493841 is about 433.5524011993.

The spelling of 81493841 in words is "eighty-one million, four hundred ninety-three thousand, eight hundred forty-one".