129523013 has 2 divisors, whose sum is σ = 129523014. Its totient is φ = 129523012.

The previous prime is 129522997. The next prime is 129523027. The reversal of 129523013 is 310325921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95218564 + 34304449 = 9758^2 + 5857^2 .

It is an emirp because it is prime and its reverse (310325921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129523013 - 2⁴ = 129522997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129523073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64761506 + 64761507.

It is an arithmetic number, because the mean of its divisors is an integer number (64761507).

Almost surely, 2^129523013 is an apocalyptic number.

It is an amenable number.

129523013 is a deficient number, since it is larger than the sum of its proper divisors (1).

129523013 is an equidigital number, since it uses as much as digits as its factorization.

129523013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 129523013 is about 11380.8177649939. The cubic root of 129523013 is about 505.9593735446.

Adding to 129523013 its reverse (310325921), we get a palindrome (439848934).

The spelling of 129523013 in words is "one hundred twenty-nine million, five hundred twenty-three thousand, thirteen".