43531013 has 2 divisors, whose sum is σ = 43531014. Its totient is φ = 43531012.

The previous prime is 43531009. The next prime is 43531021. The reversal of 43531013 is 31013534.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30448324 + 13082689 = 5518^2 + 3617^2 .

It is a cyclic number.

It is not a de Polignac number, because 43531013 - 2² = 43531009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43531513) 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, 21765506 + 21765507.

It is an arithmetic number, because the mean of its divisors is an integer number (21765507).

Almost surely, 2^43531013 is an apocalyptic number.

It is an amenable number.

43531013 is a deficient number, since it is larger than the sum of its proper divisors (1).

43531013 is an equidigital number, since it uses as much as digits as its factorization.

43531013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 43531013 is about 6597.8036497004. The cubic root of 43531013 is about 351.7760417881.

Adding to 43531013 its reverse (31013534), we get a palindrome (74544547).

The spelling of 43531013 in words is "forty-three million, five hundred thirty-one thousand, thirteen".