43005220129 has 3 divisors (see below), whose sum is σ = 43005427507. Its totient is φ = 43005012752.

The previous prime is 43005220057. The next prime is 43005220133. The reversal of 43005220129 is 92102250034.

The square root of 43005220129 is 207377.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 38347430625 + 4657789504 = 195825^2 + 68248^2 .

It is not a de Polignac number, because 43005220129 - 2³¹ = 40857736481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43005220097 and 43005220106.

It is not an unprimeable number, because it can be changed into a prime (43005220199) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 103689 + ... + 311065.

Almost surely, 2^43005220129 is an apocalyptic number.

43005220129 is the 207377-th square number.

43005220129 is the 103689-th centered octagonal number.

It is an amenable number.

43005220129 is a deficient number, since it is larger than the sum of its proper divisors (207378).

43005220129 is an frugal number, since it uses more digits than its factorization.

43005220129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414754 (or 207377 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 43005220129 in words is "forty-three billion, five million, two hundred twenty thousand, one hundred twenty-nine".