81041956 has 24 divisors (see below), whose sum is σ = 144365760. Its totient is φ = 39799200.

The previous prime is 81041911. The next prime is 81041963. The reversal of 81041956 is 65914018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130615 + ... + 131233.

It is an arithmetic number, because the mean of its divisors is an integer number (6015240).

Almost surely, 2^81041956 is an apocalyptic number.

It is an amenable number.

81041956 is a deficient number, since it is larger than the sum of its proper divisors (63323804).

81041956 is a wasteful number, since it uses less digits than its factorization.

81041956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 81041956 is about 9002.3305871313. The cubic root of 81041956 is about 432.7495631641.

The spelling of 81041956 in words is "eighty-one million, forty-one thousand, nine hundred fifty-six".