129489551 has 4 divisors (see below), whose sum is σ = 129572232. Its totient is φ = 129406872.

The previous prime is 129489539. The next prime is 129489557. The reversal of 129489551 is 155984921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155984921 = 107 ⋅1457803.

It is a cyclic number.

It is not a de Polignac number, because 129489551 - 2⁶ = 129489487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129489557) 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 in 3 ways as a sum of consecutive naturals, for example, 38945 + ... + 42138.

It is an arithmetic number, because the mean of its divisors is an integer number (32393058).

Almost surely, 2^129489551 is an apocalyptic number.

129489551 is a deficient number, since it is larger than the sum of its proper divisors (82681).

129489551 is an equidigital number, since it uses as much as digits as its factorization.

129489551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82680.

The product of its digits is 129600, while the sum is 44.

The square root of 129489551 is about 11379.3475647772. The cubic root of 129489551 is about 505.9157986093.

The spelling of 129489551 in words is "one hundred twenty-nine million, four hundred eighty-nine thousand, five hundred fifty-one".