129133409 has 2 divisors, whose sum is σ = 129133410. Its totient is φ = 129133408.

The previous prime is 129133379. The next prime is 129133427. The reversal of 129133409 is 904331921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69889600 + 59243809 = 8360^2 + 7697^2 .

It is an emirp because it is prime and its reverse (904331921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129133409 - 2⁸ = 129133153 is a prime.

It is a super-2 number, since 2×129133409² = 33350874639922562, which contains 22 as substring.

It is equal to p_7331774 and since 129133409 and 7331774 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (129133909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64566704 + 64566705.

It is an arithmetic number, because the mean of its divisors is an integer number (64566705).

Almost surely, 2^129133409 is an apocalyptic number.

It is an amenable number.

129133409 is a deficient number, since it is larger than the sum of its proper divisors (1).

129133409 is an equidigital number, since it uses as much as digits as its factorization.

129133409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 129133409 is about 11363.6881777001. The cubic root of 129133409 is about 505.4515570287.

The spelling of 129133409 in words is "one hundred twenty-nine million, one hundred thirty-three thousand, four hundred nine".