43115609 has 2 divisors, whose sum is σ = 43115610. Its totient is φ = 43115608.

The previous prime is 43115603. The next prime is 43115647. The reversal of 43115609 is 90651134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43099225 + 16384 = 6565^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 43115609 - 2⁸ = 43115353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (43115603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21557804 + 21557805.

It is an arithmetic number, because the mean of its divisors is an integer number (21557805).

Almost surely, 2^43115609 is an apocalyptic number.

It is an amenable number.

43115609 is a deficient number, since it is larger than the sum of its proper divisors (1).

43115609 is an equidigital number, since it uses as much as digits as its factorization.

43115609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 43115609 is about 6566.2477108315. The cubic root of 43115609 is about 350.6534974396.

The spelling of 43115609 in words is "forty-three million, one hundred fifteen thousand, six hundred nine".