129489571 has 4 divisors (see below), whose sum is σ = 130944600. Its totient is φ = 128034544.

The previous prime is 129489557. The next prime is 129489589. The reversal of 129489571 is 175984921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129489571 - 2⁵ = 129489539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129489071) 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, 727381 + ... + 727558.

It is an arithmetic number, because the mean of its divisors is an integer number (32736150).

Almost surely, 2^129489571 is an apocalyptic number.

129489571 is a deficient number, since it is larger than the sum of its proper divisors (1455029).

129489571 is an equidigital number, since it uses as much as digits as its factorization.

129489571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455028.

The product of its digits is 181440, while the sum is 46.

The square root of 129489571 is about 11379.3484435621. The cubic root of 129489571 is about 505.9158246559.

The spelling of 129489571 in words is "one hundred twenty-nine million, four hundred eighty-nine thousand, five hundred seventy-one".