43161023509 has 2 divisors, whose sum is σ = 43161023510. Its totient is φ = 43161023508.

The previous prime is 43161023501. The next prime is 43161023603. The reversal of 43161023509 is 90532016134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40459311025 + 2701712484 = 201145^2 + 51978^2 .

It is a cyclic number.

It is not a de Polignac number, because 43161023509 - 2³ = 43161023501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43161023501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21580511754 + 21580511755.

It is an arithmetic number, because the mean of its divisors is an integer number (21580511755).

Almost surely, 2^43161023509 is an apocalyptic number.

It is an amenable number.

43161023509 is a deficient number, since it is larger than the sum of its proper divisors (1).

43161023509 is an equidigital number, since it uses as much as digits as its factorization.

43161023509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 43161023509 in words is "forty-three billion, one hundred sixty-one million, twenty-three thousand, five hundred nine".