42443541509 has 2 divisors, whose sum is σ = 42443541510. Its totient is φ = 42443541508.

The previous prime is 42443541463. The next prime is 42443541523. The reversal of 42443541509 is 90514534424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33509133025 + 8934408484 = 183055^2 + 94522^2 .

It is a cyclic number.

It is not a de Polignac number, because 42443541509 - 2⁸ = 42443541253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42443541529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21221770754 + 21221770755.

It is an arithmetic number, because the mean of its divisors is an integer number (21221770755).

Almost surely, 2^42443541509 is an apocalyptic number.

It is an amenable number.

42443541509 is a deficient number, since it is larger than the sum of its proper divisors (1).

42443541509 is an equidigital number, since it uses as much as digits as its factorization.

42443541509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 42443541509 in words is "forty-two billion, four hundred forty-three million, five hundred forty-one thousand, five hundred nine".