165047161 has 2 divisors, whose sum is σ = 165047162. Its totient is φ = 165047160.

The previous prime is 165047159. The next prime is 165047171. The reversal of 165047161 is 161740561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102637161 + 62410000 = 10131^2 + 7900^2 .

It is a cyclic number.

It is not a de Polignac number, because 165047161 - 2¹ = 165047159 is a prime.

Together with 165047159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165047171) 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, 82523580 + 82523581.

It is an arithmetic number, because the mean of its divisors is an integer number (82523581).

Almost surely, 2^165047161 is an apocalyptic number.

It is an amenable number.

165047161 is a deficient number, since it is larger than the sum of its proper divisors (1).

165047161 is an equidigital number, since it uses as much as digits as its factorization.

165047161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 165047161 is about 12847.0681869444. The cubic root of 165047161 is about 548.5329066213.

The spelling of 165047161 in words is "one hundred sixty-five million, forty-seven thousand, one hundred sixty-one".