43315205509 has 2 divisors, whose sum is σ = 43315205510. Its totient is φ = 43315205508.

The previous prime is 43315205497. The next prime is 43315205579. The reversal of 43315205509 is 90550251334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37227773025 + 6087432484 = 192945^2 + 78022^2 .

It is a cyclic number.

It is not a de Polignac number, because 43315205509 - 2¹⁷ = 43315074437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43315205579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21657602754 + 21657602755.

It is an arithmetic number, because the mean of its divisors is an integer number (21657602755).

Almost surely, 2^43315205509 is an apocalyptic number.

It is an amenable number.

43315205509 is a deficient number, since it is larger than the sum of its proper divisors (1).

43315205509 is an equidigital number, since it uses as much as digits as its factorization.

43315205509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 37.

The spelling of 43315205509 in words is "forty-three billion, three hundred fifteen million, two hundred five thousand, five hundred nine".