521529920129 has 2 divisors, whose sum is σ = 521529920130. Its totient is φ = 521529920128.

The previous prime is 521529920077. The next prime is 521529920159. The reversal of 521529920129 is 921029925125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329076617104 + 192453303025 = 573652^2 + 438695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521529920129 is a prime.

It is a super-2 number, since 2×521529920129² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521529920159) 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 as a sum of consecutive naturals, namely, 260764960064 + 260764960065.

It is an arithmetic number, because the mean of its divisors is an integer number (260764960065).

Almost surely, 2^521529920129 is an apocalyptic number.

It is an amenable number.

521529920129 is a deficient number, since it is larger than the sum of its proper divisors (1).

521529920129 is an equidigital number, since it uses as much as digits as its factorization.

521529920129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 521529920129 in words is "five hundred twenty-one billion, five hundred twenty-nine million, nine hundred twenty thousand, one hundred twenty-nine".