843616961 has 6 divisors (see below), whose sum is σ = 927281586. Its totient is φ = 766924400.

The previous prime is 843616933. The next prime is 843617009. The reversal of 843616961 is 169616348.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 831226561 + 12390400 = 28831^2 + 3520^2 .

It is a de Polignac number, because none of the positive numbers 2^k-843616961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (843616901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3485900 + ... + 3486141.

It is an arithmetic number, because the mean of its divisors is an integer number (154546931).

Almost surely, 2^843616961 is an apocalyptic number.

It is an amenable number.

843616961 is a deficient number, since it is larger than the sum of its proper divisors (83664625).

843616961 is a wasteful number, since it uses less digits than its factorization.

843616961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6972063 (or 6972052 counting only the distinct ones).

The product of its digits is 186624, while the sum is 44.

The square root of 843616961 is about 29045.0849714715. The cubic root of 843616961 is about 944.8911200294.

The spelling of 843616961 in words is "eight hundred forty-three million, six hundred sixteen thousand, nine hundred sixty-one".