442780109 has 2 divisors, whose sum is σ = 442780110. Its totient is φ = 442780108.

The previous prime is 442780097. The next prime is 442780111. The reversal of 442780109 is 901087244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 441924484 + 855625 = 21022^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 442780109 - 2⁸ = 442779853 is a prime.

It is a Sophie Germain prime.

Together with 442780111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442786109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221390054 + 221390055.

It is an arithmetic number, because the mean of its divisors is an integer number (221390055).

Almost surely, 2^442780109 is an apocalyptic number.

It is an amenable number.

442780109 is a deficient number, since it is larger than the sum of its proper divisors (1).

442780109 is an equidigital number, since it uses as much as digits as its factorization.

442780109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 442780109 is about 21042.3408631264. The cubic root of 442780109 is about 762.1890425678.

The spelling of 442780109 in words is "four hundred forty-two million, seven hundred eighty thousand, one hundred nine".