129472521 has 8 divisors (see below), whose sum is σ = 172843584. Its totient is φ = 86208240.

The previous prime is 129472477. The next prime is 129472571. The reversal of 129472521 is 125274921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129472521 - 2⁶ = 129472457 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (129472571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23821 + ... + 28746.

It is an arithmetic number, because the mean of its divisors is an integer number (21605448).

Almost surely, 2^129472521 is an apocalyptic number.

It is an amenable number.

129472521 is a deficient number, since it is larger than the sum of its proper divisors (43371063).

129472521 is an equidigital number, since it uses as much as digits as its factorization.

129472521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53391.

The product of its digits is 10080, while the sum is 33.

The square root of 129472521 is about 11378.5992547413. The cubic root of 129472521 is about 505.8936188949.

The spelling of 129472521 in words is "one hundred twenty-nine million, four hundred seventy-two thousand, five hundred twenty-one".