81243353319 has 8 divisors (see below), whose sum is σ = 108330727920. Its totient is φ = 54159107136.

The previous prime is 81243353293. The next prime is 81243353357. The reversal of 81243353319 is 91335334218.

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

It is not a de Polignac number, because 81243353319 - 2²⁰ = 81242304743 is a prime.

It is a super-2 number, since 2×81243353319² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81243353419) 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, 720822 + ... + 825875.

It is an arithmetic number, because the mean of its divisors is an integer number (13541340990).

Almost surely, 2^81243353319 is an apocalyptic number.

81243353319 is a deficient number, since it is larger than the sum of its proper divisors (27087374601).

81243353319 is a wasteful number, since it uses less digits than its factorization.

81243353319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564209.

The product of its digits is 233280, while the sum is 42.

The spelling of 81243353319 in words is "eighty-one billion, two hundred forty-three million, three hundred fifty-three thousand, three hundred nineteen".