839555161 has 2 divisors, whose sum is σ = 839555162. Its totient is φ = 839555160.

The previous prime is 839555159. The next prime is 839555173. The reversal of 839555161 is 161555938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531025936 + 308529225 = 23044^2 + 17565^2 .

It is a cyclic number.

It is not a de Polignac number, because 839555161 - 2¹ = 839555159 is a prime.

Together with 839555159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (839555111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419777580 + 419777581.

It is an arithmetic number, because the mean of its divisors is an integer number (419777581).

Almost surely, 2^839555161 is an apocalyptic number.

It is an amenable number.

839555161 is a deficient number, since it is larger than the sum of its proper divisors (1).

839555161 is an equidigital number, since it uses as much as digits as its factorization.

839555161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 43.

The square root of 839555161 is about 28975.0782742687. The cubic root of 839555161 is about 943.3722099652.

The spelling of 839555161 in words is "eight hundred thirty-nine million, five hundred fifty-five thousand, one hundred sixty-one".