129418229 has 4 divisors (see below), whose sum is σ = 137031084. Its totient is φ = 121805376.

The previous prime is 129418189. The next prime is 129418231. The reversal of 129418229 is 922814921.

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 42276004 + 87142225 = 6502^2 + 9335^2 .

It is a cyclic number.

It is not a de Polignac number, because 129418229 - 2¹⁶ = 129352693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129418192 and 129418201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129418249) 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, 3806402 + ... + 3806435.

It is an arithmetic number, because the mean of its divisors is an integer number (34257771).

Almost surely, 2^129418229 is an apocalyptic number.

It is an amenable number.

129418229 is a deficient number, since it is larger than the sum of its proper divisors (7612855).

129418229 is an equidigital number, since it uses as much as digits as its factorization.

129418229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7612854.

The product of its digits is 20736, while the sum is 38.

The square root of 129418229 is about 11376.2132979300. The cubic root of 129418229 is about 505.8228965100.

The spelling of 129418229 in words is "one hundred twenty-nine million, four hundred eighteen thousand, two hundred twenty-nine".