442691009 has 2 divisors, whose sum is σ = 442691010. Its totient is φ = 442691008.

The previous prime is 442690967. The next prime is 442691023. The reversal of 442691009 is 900196244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 442681600 + 9409 = 21040^2 + 97^2 .

It is a cyclic number.

It is not a de Polignac number, because 442691009 - 2⁸ = 442690753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 442691009.

It is not a weakly prime, because it can be changed into another prime (442691099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221345504 + 221345505.

It is an arithmetic number, because the mean of its divisors is an integer number (221345505).

Almost surely, 2^442691009 is an apocalyptic number.

It is an amenable number.

442691009 is a deficient number, since it is larger than the sum of its proper divisors (1).

442691009 is an equidigital number, since it uses as much as digits as its factorization.

442691009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 442691009 is about 21040.2235967206. The cubic root of 442691009 is about 762.1379144058.

The spelling of 442691009 in words is "four hundred forty-two million, six hundred ninety-one thousand, nine".