842331989 has 2 divisors, whose sum is σ = 842331990. Its totient is φ = 842331988.

The previous prime is 842331961. The next prime is 842332019. The reversal of 842331989 is 989133248.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509269489 + 333062500 = 22567^2 + 18250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842331989 is a prime.

It is a super-2 number, since 2×842331989² = 1419046359385392242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842331949) 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, 421165994 + 421165995.

It is an arithmetic number, because the mean of its divisors is an integer number (421165995).

Almost surely, 2^842331989 is an apocalyptic number.

It is an amenable number.

842331989 is a deficient number, since it is larger than the sum of its proper divisors (1).

842331989 is an equidigital number, since it uses as much as digits as its factorization.

842331989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 842331989 is about 29022.9562415685. The cubic root of 842331989 is about 944.4111329945.

The spelling of 842331989 in words is "eight hundred forty-two million, three hundred thirty-one thousand, nine hundred eighty-nine".