129136837 has 4 divisors (see below), whose sum is σ = 129459276. Its totient is φ = 128814400.

The previous prime is 129136829. The next prime is 129136873. The reversal of 129136837 is 738631921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127215841 + 1920996 = 11279^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 129136837 - 2³ = 129136829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129136837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129136897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160618 + ... + 161419.

It is an arithmetic number, because the mean of its divisors is an integer number (32364819).

Almost surely, 2^129136837 is an apocalyptic number.

It is an amenable number.

129136837 is a deficient number, since it is larger than the sum of its proper divisors (322439).

129136837 is an equidigital number, since it uses as much as digits as its factorization.

129136837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322438.

The product of its digits is 54432, while the sum is 40.

The square root of 129136837 is about 11363.8390080113. The cubic root of 129136837 is about 505.4560295935.

The spelling of 129136837 in words is "one hundred twenty-nine million, one hundred thirty-six thousand, eight hundred thirty-seven".