43158109 has 2 divisors, whose sum is σ = 43158110. Its totient is φ = 43158108.

The previous prime is 43158103. The next prime is 43158127. The reversal of 43158109 is 90185134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23328900 + 19829209 = 4830^2 + 4453^2 .

It is a cyclic number.

It is not a de Polignac number, because 43158109 - 2⁷ = 43157981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43158103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21579054 + 21579055.

It is an arithmetic number, because the mean of its divisors is an integer number (21579055).

Almost surely, 2^43158109 is an apocalyptic number.

It is an amenable number.

43158109 is a deficient number, since it is larger than the sum of its proper divisors (1).

43158109 is an equidigital number, since it uses as much as digits as its factorization.

43158109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 43158109 is about 6569.4831607974. The cubic root of 43158109 is about 350.7686752140.

The spelling of 43158109 in words is "forty-three million, one hundred fifty-eight thousand, one hundred nine".