81471232973 has 8 divisors (see below), whose sum is σ = 92899324728. Its totient is φ = 70780437504.

The previous prime is 81471232967. The next prime is 81471233009. The reversal of 81471232973 is 37923217418.

It can be written as a sum of positive squares in 4 ways, for example, as 30113702089 + 51357530884 = 173533^2 + 226622^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81471232973 - 2¹² = 81471228877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81471232903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184323836 + ... + 184324277.

It is an arithmetic number, because the mean of its divisors is an integer number (11612415591).

Almost surely, 2^81471232973 is an apocalyptic number.

It is an amenable number.

81471232973 is a deficient number, since it is larger than the sum of its proper divisors (11428091755).

81471232973 is a wasteful number, since it uses less digits than its factorization.

81471232973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368648143.

The product of its digits is 508032, while the sum is 47.

The spelling of 81471232973 in words is "eighty-one billion, four hundred seventy-one million, two hundred thirty-two thousand, nine hundred seventy-three".