81593115439 has 8 divisors (see below), whose sum is σ = 90264343680. Its totient is φ = 73130832600.

The previous prime is 81593115437. The next prime is 81593115491. The reversal of 81593115439 is 93451139518.

It is a happy number.

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 81593115439 - 2¹ = 81593115437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81593115392 and 81593115401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81593115437) 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, 52235529 + ... + 52237090.

It is an arithmetic number, because the mean of its divisors is an integer number (11283042960).

Almost surely, 2^81593115439 is an apocalyptic number.

81593115439 is a deficient number, since it is larger than the sum of its proper divisors (8671228241).

81593115439 is a wasteful number, since it uses less digits than its factorization.

81593115439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104472701.

The product of its digits is 583200, while the sum is 49.

The spelling of 81593115439 in words is "eighty-one billion, five hundred ninety-three million, one hundred fifteen thousand, four hundred thirty-nine".