81848915 has 8 divisors (see below), whose sum is σ = 100614528. Its totient is φ = 63881920.

The previous prime is 81848911. The next prime is 81848917. The reversal of 81848915 is 51984818.

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

It is not a de Polignac number, because 81848915 - 2² = 81848911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81848911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199427 + ... + 199836.

It is an arithmetic number, because the mean of its divisors is an integer number (12576816).

Almost surely, 2^81848915 is an apocalyptic number.

81848915 is a deficient number, since it is larger than the sum of its proper divisors (18765613).

81848915 is a wasteful number, since it uses less digits than its factorization.

81848915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399309.

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

The square root of 81848915 is about 9047.0390183750. The cubic root of 81848915 is about 434.1811609635.

The spelling of 81848915 in words is "eighty-one million, eight hundred forty-eight thousand, nine hundred fifteen".