43142909 has 2 divisors, whose sum is σ = 43142910. Its totient is φ = 43142908.

The previous prime is 43142899. The next prime is 43142941. The reversal of 43142909 is 90924134.

It is a happy number.

It is an a-pointer prime, because the next prime (43142941) can be obtained adding 43142909 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38316100 + 4826809 = 6190^2 + 2197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43142909 is a prime.

It is a super-2 number, since 2×43142909² = 3722621193964562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43142969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21571454 + 21571455.

It is an arithmetic number, because the mean of its divisors is an integer number (21571455).

Almost surely, 2^43142909 is an apocalyptic number.

It is an amenable number.

43142909 is a deficient number, since it is larger than the sum of its proper divisors (1).

43142909 is an equidigital number, since it uses as much as digits as its factorization.

43142909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 43142909 is about 6568.3261947014. The cubic root of 43142909 is about 350.7274909110.

The spelling of 43142909 in words is "forty-three million, one hundred forty-two thousand, nine hundred nine".