442021093 has 2 divisors, whose sum is σ = 442021094. Its totient is φ = 442021092.

The previous prime is 442021057. The next prime is 442021109. The reversal of 442021093 is 390120244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375468129 + 66552964 = 19377^2 + 8158^2 .

It is a cyclic number.

It is not a de Polignac number, because 442021093 - 2¹⁷ = 441890021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442021003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221010546 + 221010547.

It is an arithmetic number, because the mean of its divisors is an integer number (221010547).

Almost surely, 2^442021093 is an apocalyptic number.

It is an amenable number.

442021093 is a deficient number, since it is larger than the sum of its proper divisors (1).

442021093 is an equidigital number, since it uses as much as digits as its factorization.

442021093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 442021093 is about 21024.2976814922. The cubic root of 442021093 is about 761.7532773159.

The spelling of 442021093 in words is "four hundred forty-two million, twenty-one thousand, ninety-three".