129535941236 has 24 divisors (see below), whose sum is σ = 244163776584. Its totient is φ = 59776427520.

The previous prime is 129535941209. The next prime is 129535941257. The reversal of 129535941236 is 632149535921.

It can be written as a sum of positive squares in 4 ways, for example, as 18276336100 + 111259605136 = 135190^2 + 333556^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144176 + ... + 529016.

It is an arithmetic number, because the mean of its divisors is an integer number (10173490691).

Almost surely, 2^129535941236 is an apocalyptic number.

It is an amenable number.

129535941236 is a deficient number, since it is larger than the sum of its proper divisors (114627835348).

129535941236 is a wasteful number, since it uses less digits than its factorization.

129535941236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391331 (or 391329 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 50.

The spelling of 129535941236 in words is "one hundred twenty-nine billion, five hundred thirty-five million, nine hundred forty-one thousand, two hundred thirty-six".