81006845 has 8 divisors (see below), whose sum is σ = 97274976. Its totient is φ = 64760976.

The previous prime is 81006839. The next prime is 81006907. The reversal of 81006845 is 54860018.

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 81006845 - 2⁴ = 81006829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 3914 + ... + 13316.

It is an arithmetic number, because the mean of its divisors is an integer number (12159372).

Almost surely, 2^81006845 is an apocalyptic number.

It is an amenable number.

81006845 is a deficient number, since it is larger than the sum of its proper divisors (16268131).

81006845 is a wasteful number, since it uses less digits than its factorization.

81006845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11131.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 81006845 is about 9000.3802697442. The cubic root of 81006845 is about 432.6870586481.

The spelling of 81006845 in words is "eighty-one million, six thousand, eight hundred forty-five".