129424811 has 4 divisors (see below), whose sum is σ = 130444032. Its totient is φ = 128405592.

The previous prime is 129424807. The next prime is 129424817. The reversal of 129424811 is 118424921.

It is a happy number.

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 129424811 - 2² = 129424807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129424817) 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, 509420 + ... + 509673.

It is an arithmetic number, because the mean of its divisors is an integer number (32611008).

Almost surely, 2^129424811 is an apocalyptic number.

129424811 is a deficient number, since it is larger than the sum of its proper divisors (1019221).

129424811 is a wasteful number, since it uses less digits than its factorization.

129424811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019220.

The product of its digits is 4608, while the sum is 32.

The square root of 129424811 is about 11376.5025820768. The cubic root of 129424811 is about 505.8314714737.

The spelling of 129424811 in words is "one hundred twenty-nine million, four hundred twenty-four thousand, eight hundred eleven".