129408481 has 4 divisors (see below), whose sum is σ = 130396464. Its totient is φ = 128420500.

The previous prime is 129408473. The next prime is 129408491. The reversal of 129408481 is 184804921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129408481 - 2³ = 129408473 is a prime.

It is a super-2 number, since 2×129408481² = 33493109909454722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129408481.

It is not an unprimeable number, because it can be changed into a prime (129408401) 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 in 3 ways as a sum of consecutive naturals, for example, 493795 + ... + 494056.

It is an arithmetic number, because the mean of its divisors is an integer number (32599116).

Almost surely, 2^129408481 is an apocalyptic number.

It is an amenable number.

129408481 is a deficient number, since it is larger than the sum of its proper divisors (987983).

129408481 is an equidigital number, since it uses as much as digits as its factorization.

129408481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987982.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 129408481 is about 11375.7848520443. The cubic root of 129408481 is about 505.8101963790.

The spelling of 129408481 in words is "one hundred twenty-nine million, four hundred eight thousand, four hundred eighty-one".