129133427 has 2 divisors, whose sum is σ = 129133428. Its totient is φ = 129133426.

The previous prime is 129133409. The next prime is 129133447. The reversal of 129133427 is 724331921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129133427 - 2¹⁰ = 129132403 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129133393 and 129133402.

It is not a weakly prime, because it can be changed into another prime (129133447) 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 as a sum of consecutive naturals, namely, 64566713 + 64566714.

It is an arithmetic number, because the mean of its divisors is an integer number (64566714).

Almost surely, 2^129133427 is an apocalyptic number.

129133427 is a deficient number, since it is larger than the sum of its proper divisors (1).

129133427 is an equidigital number, since it uses as much as digits as its factorization.

129133427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 129133427 is about 11363.6889696964. The cubic root of 129133427 is about 505.4515805138.

The spelling of 129133427 in words is "one hundred twenty-nine million, one hundred thirty-three thousand, four hundred twenty-seven".