129536841 has 24 divisors (see below), whose sum is σ = 205200000. Its totient is φ = 72442272.

The previous prime is 129536837. The next prime is 129536903. The reversal of 129536841 is 148635921.

It is not a de Polignac number, because 129536841 - 2² = 129536837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129536841.

It is not an unprimeable number, because it can be changed into a prime (129536441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2466 + ... + 16283.

It is an arithmetic number, because the mean of its divisors is an integer number (8550000).

Almost surely, 2^129536841 is an apocalyptic number.

It is an amenable number.

129536841 is a deficient number, since it is larger than the sum of its proper divisors (75663159).

129536841 is a wasteful number, since it uses less digits than its factorization.

129536841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18813 (or 18806 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 129536841 is about 11381.4252622420. The cubic root of 129536841 is about 505.9773784718.

The spelling of 129536841 in words is "one hundred twenty-nine million, five hundred thirty-six thousand, eight hundred forty-one".