129435331 has 4 divisors (see below), whose sum is σ = 137049192. Its totient is φ = 121821472.

The previous prime is 129435307. The next prime is 129435349. The reversal of 129435331 is 133534921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133534921 = 13 ⋅10271917.

It is a cyclic number.

It is not a de Polignac number, because 129435331 - 2⁹ = 129434819 is a prime.

It is a super-2 number, since 2×129435331² = 33507009822159122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129435293 and 129435302.

It is not an unprimeable number, because it can be changed into a prime (129430331) 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, 3806905 + ... + 3806938.

It is an arithmetic number, because the mean of its divisors is an integer number (34262298).

Almost surely, 2^129435331 is an apocalyptic number.

129435331 is a deficient number, since it is larger than the sum of its proper divisors (7613861).

129435331 is an equidigital number, since it uses as much as digits as its factorization.

129435331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7613860.

The product of its digits is 9720, while the sum is 31.

The square root of 129435331 is about 11376.9649291892. The cubic root of 129435331 is about 505.8451762208.

The spelling of 129435331 in words is "one hundred twenty-nine million, four hundred thirty-five thousand, three hundred thirty-one".