442860991 has 2 divisors, whose sum is σ = 442860992. Its totient is φ = 442860990.

The previous prime is 442860989. The next prime is 442861007. The reversal of 442860991 is 199068244.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442860991 - 2¹ = 442860989 is a prime.

It is a super-2 number, since 2×442860991² = 392251714699004162, which contains 22 as substring.

Together with 442860989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442860091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221430495 + 221430496.

It is an arithmetic number, because the mean of its divisors is an integer number (221430496).

Almost surely, 2^442860991 is an apocalyptic number.

442860991 is a deficient number, since it is larger than the sum of its proper divisors (1).

442860991 is an equidigital number, since it uses as much as digits as its factorization.

442860991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 442860991 is about 21044.2626623030. The cubic root of 442860991 is about 762.2354490644.

The spelling of 442860991 in words is "four hundred forty-two million, eight hundred sixty thousand, nine hundred ninety-one".