129524821 has 2 divisors, whose sum is σ = 129524822. Its totient is φ = 129524820.

The previous prime is 129524797. The next prime is 129524861. The reversal of 129524821 is 128425921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117483921 + 12040900 = 10839^2 + 3470^2 .

It is a cyclic number.

It is not a de Polignac number, because 129524821 - 2¹¹ = 129522773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129524861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64762410 + 64762411.

It is an arithmetic number, because the mean of its divisors is an integer number (64762411).

Almost surely, 2^129524821 is an apocalyptic number.

It is an amenable number.

129524821 is a deficient number, since it is larger than the sum of its proper divisors (1).

129524821 is an equidigital number, since it uses as much as digits as its factorization.

129524821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The square root of 129524821 is about 11380.8971966186. The cubic root of 129524821 is about 505.9617277473.

The spelling of 129524821 in words is "one hundred twenty-nine million, five hundred twenty-four thousand, eight hundred twenty-one".