81732212449 has 8 divisors (see below), whose sum is σ = 82256086440. Its totient is φ = 81209968896.

The previous prime is 81732212431. The next prime is 81732212453. The reversal of 81732212449 is 94421223718.

It can be written as a sum of positive squares in 4 ways, for example, as 8348111424 + 73384101025 = 91368^2 + 270895^2 .

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 81732212449 - 2¹⁹ = 81731688161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81732212459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306952 + ... + 507625.

It is an arithmetic number, because the mean of its divisors is an integer number (10282010805).

Almost surely, 2^81732212449 is an apocalyptic number.

It is an amenable number.

81732212449 is a deficient number, since it is larger than the sum of its proper divisors (523873991).

81732212449 is a wasteful number, since it uses less digits than its factorization.

81732212449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815219.

The product of its digits is 193536, while the sum is 43.

The spelling of 81732212449 in words is "eighty-one billion, seven hundred thirty-two million, two hundred twelve thousand, four hundred forty-nine".