43643255309 has 2 divisors, whose sum is σ = 43643255310. Its totient is φ = 43643255308.

The previous prime is 43643255237. The next prime is 43643255353. The reversal of 43643255309 is 90355234634.

It is a happy number.

It is an a-pointer prime, because the next prime (43643255353) can be obtained adding 43643255309 to its sum of digits (44).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31383894025 + 12259361284 = 177155^2 + 110722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43643255309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43643255309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43643255809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21821627654 + 21821627655.

It is an arithmetic number, because the mean of its divisors is an integer number (21821627655).

Almost surely, 2^43643255309 is an apocalyptic number.

It is an amenable number.

43643255309 is a deficient number, since it is larger than the sum of its proper divisors (1).

43643255309 is an equidigital number, since it uses as much as digits as its factorization.

43643255309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 44.

It can be divided in two parts, 4364325 and 5309, that added together give a palindrome (4369634).

The spelling of 43643255309 in words is "forty-three billion, six hundred forty-three million, two hundred fifty-five thousand, three hundred nine".