129836941 has 4 divisors (see below), whose sum is σ = 139824412. Its totient is φ = 119849472.

The previous prime is 129836933. The next prime is 129836947. The reversal of 129836941 is 149638921.

It is a happy number.

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 67584841 + 62252100 = 8221^2 + 7890^2 .

It is a cyclic number.

It is not a de Polignac number, because 129836941 - 2³ = 129836933 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129836947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4993716 + ... + 4993741.

It is an arithmetic number, because the mean of its divisors is an integer number (34956103).

Almost surely, 2^129836941 is an apocalyptic number.

It is an amenable number.

129836941 is a deficient number, since it is larger than the sum of its proper divisors (9987471).

129836941 is an equidigital number, since it uses as much as digits as its factorization.

129836941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9987470.

The product of its digits is 93312, while the sum is 43.

The square root of 129836941 is about 11394.6013971530. The cubic root of 129836941 is about 506.3678123210.

The spelling of 129836941 in words is "one hundred twenty-nine million, eight hundred thirty-six thousand, nine hundred forty-one".