129212513 has 2 divisors, whose sum is σ = 129212514. Its totient is φ = 129212512.

The previous prime is 129212471. The next prime is 129212519. The reversal of 129212513 is 315212921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122389969 + 6822544 = 11063^2 + 2612^2 .

It is an emirp because it is prime and its reverse (315212921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129212513 - 2¹⁸ = 128950369 is a prime.

It is not a weakly prime, because it can be changed into another prime (129212519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64606256 + 64606257.

It is an arithmetic number, because the mean of its divisors is an integer number (64606257).

Almost surely, 2^129212513 is an apocalyptic number.

It is an amenable number.

129212513 is a deficient number, since it is larger than the sum of its proper divisors (1).

129212513 is an equidigital number, since it uses as much as digits as its factorization.

129212513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 129212513 is about 11367.1682049664. The cubic root of 129212513 is about 505.5547450903.

The spelling of 129212513 in words is "one hundred twenty-nine million, two hundred twelve thousand, five hundred thirteen".