129824881 has 2 divisors, whose sum is σ = 129824882. Its totient is φ = 129824880.

The previous prime is 129824867. The next prime is 129824911. The reversal of 129824881 is 188428921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111197025 + 18627856 = 10545^2 + 4316^2 .

It is a cyclic number.

It is not a de Polignac number, because 129824881 - 2⁹ = 129824369 is a prime.

It is a super-2 number, since 2×129824881² = 33708999453328322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129824381) 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 as a sum of consecutive naturals, namely, 64912440 + 64912441.

It is an arithmetic number, because the mean of its divisors is an integer number (64912441).

Almost surely, 2^129824881 is an apocalyptic number.

It is an amenable number.

129824881 is a deficient number, since it is larger than the sum of its proper divisors (1).

129824881 is an equidigital number, since it uses as much as digits as its factorization.

129824881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 43.

The square root of 129824881 is about 11394.0721868874. The cubic root of 129824881 is about 506.3521337197.

The spelling of 129824881 in words is "one hundred twenty-nine million, eight hundred twenty-four thousand, eight hundred eighty-one".