43105613 has 2 divisors, whose sum is σ = 43105614. Its totient is φ = 43105612.

The previous prime is 43105609. The next prime is 43105631. The reversal of 43105613 is 31650134.

43105613 = 4642² + 4643².

It is a happy number.

Together with next prime (43105631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21557449 + 21548164 = 4643^2 + 4642^2 .

It is a cyclic number.

It is not a de Polignac number, because 43105613 - 2² = 43105609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43105633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21552806 + 21552807.

It is an arithmetic number, because the mean of its divisors is an integer number (21552807).

Almost surely, 2^43105613 is an apocalyptic number.

43105613 is the 4643-rd centered square number.

It is an amenable number.

43105613 is a deficient number, since it is larger than the sum of its proper divisors (1).

43105613 is an equidigital number, since it uses as much as digits as its factorization.

43105613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 43105613 is about 6565.4865013950. The cubic root of 43105613 is about 350.6263966336.

Adding to 43105613 its reverse (31650134), we get a palindrome (74755747).

The spelling of 43105613 in words is "forty-three million, one hundred five thousand, six hundred thirteen".