81348157439 has 8 divisors (see below), whose sum is σ = 82142361840. Its totient is φ = 80554824000.

The previous prime is 81348157391. The next prime is 81348157447. The reversal of 81348157439 is 93475184318.

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 81348157439 - 2²⁴ = 81331380223 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 (81348157469) 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, 29237 + ... + 404414.

It is an arithmetic number, because the mean of its divisors is an integer number (10267795230).

Almost surely, 2^81348157439 is an apocalyptic number.

81348157439 is a deficient number, since it is larger than the sum of its proper divisors (794204401).

81348157439 is a wasteful number, since it uses less digits than its factorization.

81348157439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435481.

The product of its digits is 2903040, while the sum is 53.

The spelling of 81348157439 in words is "eighty-one billion, three hundred forty-eight million, one hundred fifty-seven thousand, four hundred thirty-nine".