81047681001 has 16 divisors (see below), whose sum is σ = 137223587200. Its totient is φ = 46312960464.

The previous prime is 81047680997. The next prime is 81047681023. The reversal of 81047681001 is 10018674018.

81047681001 is a `hidden beast` number, since 81 + 0 + 476 + 8 + 100 + 1 = 666.

It is not a de Polignac number, because 81047681001 - 2² = 81047680997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81047681051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214411666 + ... + 214412043.

It is an arithmetic number, because the mean of its divisors is an integer number (8576474200).

Almost surely, 2^81047681001 is an apocalyptic number.

It is an amenable number.

81047681001 is a deficient number, since it is larger than the sum of its proper divisors (56175906199).

81047681001 is a wasteful number, since it uses less digits than its factorization.

81047681001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428823725 (or 428823719 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 81047681001 in words is "eighty-one billion, forty-seven million, six hundred eighty-one thousand, one".