129389551 has 2 divisors, whose sum is σ = 129389552. Its totient is φ = 129389550.

The previous prime is 129389549. The next prime is 129389587. The reversal of 129389551 is 155983921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129389551 - 2¹ = 129389549 is a prime.

Together with 129389549, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 129389498 and 129389507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129389501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64694775 + 64694776.

It is an arithmetic number, because the mean of its divisors is an integer number (64694776).

Almost surely, 2^129389551 is an apocalyptic number.

129389551 is a deficient number, since it is larger than the sum of its proper divisors (1).

129389551 is an equidigital number, since it uses as much as digits as its factorization.

129389551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 43.

The square root of 129389551 is about 11374.9527911108. The cubic root of 129389551 is about 505.7855317051.

The spelling of 129389551 in words is "one hundred twenty-nine million, three hundred eighty-nine thousand, five hundred fifty-one".