128931812772839 has 16 divisors (see below), whose sum is σ = 135999920746080. Its totient is φ = 121892002053120.

The previous prime is 128931812772797. The next prime is 128931812772887. The reversal of 128931812772839 is 938277218139821.

It is a cyclic number.

It is not a de Polignac number, because 128931812772839 - 2²⁰ = 128931811724263 is a prime.

It is a super-2 number, since 2×128931812772839² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128931812774839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61098527 + ... + 63173519.

It is an arithmetic number, because the mean of its divisors is an integer number (8499995046630).

Almost surely, 2^{128931812772839} is an apocalyptic number.

128931812772839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

128931812772839 is a deficient number, since it is larger than the sum of its proper divisors (7068107973241).

128931812772839 is a wasteful number, since it uses less digits than its factorization.

128931812772839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081810.

The product of its digits is 146313216, while the sum is 71.

The spelling of 128931812772839 in words is "one hundred twenty-eight trillion, nine hundred thirty-one billion, eight hundred twelve million, seven hundred seventy-two thousand, eight hundred thirty-nine".