43111009 has 2 divisors, whose sum is σ = 43111010. Its totient is φ = 43111008.

The previous prime is 43110973. The next prime is 43111021. The reversal of 43111009 is 90011134.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38688400 + 4422609 = 6220^2 + 2103^2 .

It is a cyclic number.

It is not a de Polignac number, because 43111009 - 2⁹ = 43110497 is a prime.

It is not a weakly prime, because it can be changed into another prime (43111909) 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, 21555504 + 21555505.

It is an arithmetic number, because the mean of its divisors is an integer number (21555505).

Almost surely, 2^43111009 is an apocalyptic number.

It is an amenable number.

43111009 is a deficient number, since it is larger than the sum of its proper divisors (1).

43111009 is an equidigital number, since it uses as much as digits as its factorization.

43111009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 43111009 is about 6565.8974253334. The cubic root of 43111009 is about 350.6410266006.

The spelling of 43111009 in words is "forty-three million, one hundred eleven thousand, nine".