81160844 has 6 divisors (see below), whose sum is σ = 142031484. Its totient is φ = 40580420.

The previous prime is 81160841. The next prime is 81160957. The reversal of 81160844 is 44806118.

It is a self number, because there is not a number n which added to its sum of digits gives 81160844.

It is not an unprimeable number, because it can be changed into a prime (81160841) 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 as a sum of consecutive naturals, namely, 10145102 + ... + 10145109.

It is an arithmetic number, because the mean of its divisors is an integer number (23671914).

Almost surely, 2^81160844 is an apocalyptic number.

It is an amenable number.

81160844 is a deficient number, since it is larger than the sum of its proper divisors (60870640).

81160844 is a wasteful number, since it uses less digits than its factorization.

81160844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20290215 (or 20290213 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 81160844 is about 9008.9313461698. The cubic root of 81160844 is about 432.9610733282.

The spelling of 81160844 in words is "eighty-one million, one hundred sixty thousand, eight hundred forty-four".