81296320439 has 8 divisors (see below), whose sum is σ = 82583247360. Its totient is φ = 80011556856.

The previous prime is 81296320411. The next prime is 81296320447. The reversal of 81296320439 is 93402369218.

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 81296320439 - 2²⁴ = 81279543223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81296320393 and 81296320402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81296320459) 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 7 ways as a sum of consecutive naturals, for example, 464999 + ... + 615480.

It is an arithmetic number, because the mean of its divisors is an integer number (10322905920).

Almost surely, 2^81296320439 is an apocalyptic number.

81296320439 is a deficient number, since it is larger than the sum of its proper divisors (1286926921).

81296320439 is a wasteful number, since it uses less digits than its factorization.

81296320439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081669.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 81296320439 in words is "eighty-one billion, two hundred ninety-six million, three hundred twenty thousand, four hundred thirty-nine".