605721161 has 2 divisors, whose sum is σ = 605721162. Its totient is φ = 605721160.

The previous prime is 605721157. The next prime is 605721187. The reversal of 605721161 is 161127506.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382398025 + 223323136 = 19555^2 + 14944^2 .

It is a cyclic number.

It is not a de Polignac number, because 605721161 - 2² = 605721157 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (605721461) 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 as a sum of consecutive naturals, namely, 302860580 + 302860581.

It is an arithmetic number, because the mean of its divisors is an integer number (302860581).

Almost surely, 2^605721161 is an apocalyptic number.

It is an amenable number.

605721161 is a deficient number, since it is larger than the sum of its proper divisors (1).

605721161 is an equidigital number, since it uses as much as digits as its factorization.

605721161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 605721161 is about 24611.4030684965. The cubic root of 605721161 is about 846.1049750789.

Adding to 605721161 its reverse (161127506), we get a palindrome (766848667).

The spelling of 605721161 in words is "six hundred five million, seven hundred twenty-one thousand, one hundred sixty-one".