442780111 has 2 divisors, whose sum is σ = 442780112. Its totient is φ = 442780110.

The previous prime is 442780109. The next prime is 442780193. The reversal of 442780111 is 111087244.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442780111 - 2¹ = 442780109 is a prime.

Together with 442780109, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 442780111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442780511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221390055 + 221390056.

It is an arithmetic number, because the mean of its divisors is an integer number (221390056).

Almost surely, 2^442780111 is an apocalyptic number.

442780111 is a deficient number, since it is larger than the sum of its proper divisors (1).

442780111 is an equidigital number, since it uses as much as digits as its factorization.

442780111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 442780111 is about 21042.3409106497. The cubic root of 442780111 is about 762.1890437154.

The spelling of 442780111 in words is "four hundred forty-two million, seven hundred eighty thousand, one hundred eleven".