81846845 has 16 divisors (see below), whose sum is σ = 103973760. Its totient is φ = 61744704.

The previous prime is 81846841. The next prime is 81846847. The reversal of 81846845 is 54864818.

It is a cyclic number.

It is not a de Polignac number, because 81846845 - 2² = 81846841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81846796 and 81846805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81846841) 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 15 ways as a sum of consecutive naturals, for example, 329 + ... + 12798.

It is an arithmetic number, because the mean of its divisors is an integer number (6498360).

Almost surely, 2^81846845 is an apocalyptic number.

It is an amenable number.

81846845 is a deficient number, since it is larger than the sum of its proper divisors (22126915).

81846845 is a wasteful number, since it uses less digits than its factorization.

81846845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13204.

The product of its digits is 245760, while the sum is 44.

The square root of 81846845 is about 9046.9246155807. The cubic root of 81846845 is about 434.1775007131.

The spelling of 81846845 in words is "eighty-one million, eight hundred forty-six thousand, eight hundred forty-five".