81041012 has 24 divisors (see below), whose sum is σ = 153298656. Its totient is φ = 37264608.

The previous prime is 81041003. The next prime is 81041017. The reversal of 81041012 is 21014018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81041017) 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 in 7 ways as a sum of consecutive naturals, for example, 11963 + ... + 17469.

It is an arithmetic number, because the mean of its divisors is an integer number (6387444).

Almost surely, 2^81041012 is an apocalyptic number.

It is an amenable number.

81041012 is a deficient number, since it is larger than the sum of its proper divisors (72257644).

81041012 is a wasteful number, since it uses less digits than its factorization.

81041012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5807 (or 5805 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 81041012 is about 9002.2781561114. The cubic root of 81041012 is about 432.7478828938.

The spelling of 81041012 in words is "eighty-one million, forty-one thousand, twelve".