81352845 has 48 divisors (see below), whose sum is σ = 161920512. Its totient is φ = 37013760.

The previous prime is 81352829. The next prime is 81352867. The reversal of 81352845 is 54825318.

It is a happy number.

It is not a de Polignac number, because 81352845 - 2⁴ = 81352829 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 84889 + ... + 85841.

It is an arithmetic number, because the mean of its divisors is an integer number (3373344).

Almost surely, 2^81352845 is an apocalyptic number.

It is an amenable number.

81352845 is a deficient number, since it is larger than the sum of its proper divisors (80567667).

81352845 is a wasteful number, since it uses less digits than its factorization.

81352845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1239 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 81352845 is about 9019.5811987032. The cubic root of 81352845 is about 433.3022209747.

The spelling of 81352845 in words is "eighty-one million, three hundred fifty-two thousand, eight hundred forty-five".