439242864509 has 2 divisors, whose sum is σ = 439242864510. Its totient is φ = 439242864508.

The previous prime is 439242864497. The next prime is 439242864523. The reversal of 439242864509 is 905468242934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395039904484 + 44202960025 = 628522^2 + 210245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439242864509 is a prime.

It is a super-2 number, since 2×439242864509² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439242864569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219621432254 + 219621432255.

It is an arithmetic number, because the mean of its divisors is an integer number (219621432255).

Almost surely, 2^439242864509 is an apocalyptic number.

It is an amenable number.

439242864509 is a deficient number, since it is larger than the sum of its proper divisors (1).

439242864509 is an equidigital number, since it uses as much as digits as its factorization.

439242864509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 439242864509 in words is "four hundred thirty-nine billion, two hundred forty-two million, eight hundred sixty-four thousand, five hundred nine".