81071108 has 6 divisors (see below), whose sum is σ = 141874446. Its totient is φ = 40535552.

The previous prime is 81071077. The next prime is 81071129. The reversal of 81071108 is 80117018.

It can be written as a sum of positive squares in only one way, i.e., 54051904 + 27019204 = 7352^2 + 5198^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133885 + ... + 10133892.

It is an arithmetic number, because the mean of its divisors is an integer number (23645741).

Almost surely, 2^81071108 is an apocalyptic number.

It is an amenable number.

81071108 is a deficient number, since it is larger than the sum of its proper divisors (60803338).

81071108 is a wasteful number, since it uses less digits than its factorization.

81071108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20267781 (or 20267779 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 81071108 is about 9003.9495778242. The cubic root of 81071108 is about 432.8014457672.

The spelling of 81071108 in words is "eighty-one million, seventy-one thousand, one hundred eight".