129273954529 has 2 divisors, whose sum is σ = 129273954530. Its totient is φ = 129273954528.

The previous prime is 129273954463. The next prime is 129273954569. The reversal of 129273954529 is 925459372921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105269100304 + 24004854225 = 324452^2 + 154935^2 .

It is a cyclic number.

It is not a de Polignac number, because 129273954529 - 2¹¹ = 129273952481 is a prime.

It is a super-2 number, since 2×129273954529² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129273954569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64636977264 + 64636977265.

It is an arithmetic number, because the mean of its divisors is an integer number (64636977265).

Almost surely, 2^129273954529 is an apocalyptic number.

It is an amenable number.

129273954529 is a deficient number, since it is larger than the sum of its proper divisors (1).

129273954529 is an equidigital number, since it uses as much as digits as its factorization.

129273954529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12247200, while the sum is 58.

The spelling of 129273954529 in words is "one hundred twenty-nine billion, two hundred seventy-three million, nine hundred fifty-four thousand, five hundred twenty-nine".