442544681 has 2 divisors, whose sum is σ = 442544682. Its totient is φ = 442544680.

The previous prime is 442544671. The next prime is 442544699. The reversal of 442544681 is 186445244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 350288656 + 92256025 = 18716^2 + 9605^2 .

It is a cyclic number.

It is not a de Polignac number, because 442544681 - 2²⁶ = 375435817 is a prime.

It is a super-2 number, since 2×442544681² = 391691589362783522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (442544671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221272340 + 221272341.

It is an arithmetic number, because the mean of its divisors is an integer number (221272341).

Almost surely, 2^442544681 is an apocalyptic number.

It is an amenable number.

442544681 is a deficient number, since it is larger than the sum of its proper divisors (1).

442544681 is an equidigital number, since it uses as much as digits as its factorization.

442544681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122880, while the sum is 38.

The square root of 442544681 is about 21036.7459698500. The cubic root of 442544681 is about 762.0539322721.

The spelling of 442544681 in words is "four hundred forty-two million, five hundred forty-four thousand, six hundred eighty-one".