43129913 has 2 divisors, whose sum is σ = 43129914. Its totient is φ = 43129912.

The previous prime is 43129907. The next prime is 43129937. The reversal of 43129913 is 31992134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32684089 + 10445824 = 5717^2 + 3232^2 .

It is a cyclic number.

It is not a de Polignac number, because 43129913 - 2⁸ = 43129657 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43129913.

It is not a weakly prime, because it can be changed into another prime (43129613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21564956 + 21564957.

It is an arithmetic number, because the mean of its divisors is an integer number (21564957).

Almost surely, 2^43129913 is an apocalyptic number.

It is an amenable number.

43129913 is a deficient number, since it is larger than the sum of its proper divisors (1).

43129913 is an equidigital number, since it uses as much as digits as its factorization.

43129913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 43129913 is about 6567.3368270555. The cubic root of 43129913 is about 350.6922706602.

The spelling of 43129913 in words is "forty-three million, one hundred twenty-nine thousand, nine hundred thirteen".