505515161 has 2 divisors, whose sum is σ = 505515162. Its totient is φ = 505515160.

The previous prime is 505515133. The next prime is 505515163. The reversal of 505515161 is 161515505.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504271936 + 1243225 = 22456^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 505515161 - 2⁶ = 505515097 is a prime.

Together with 505515163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505515163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252757580 + 252757581.

It is an arithmetic number, because the mean of its divisors is an integer number (252757581).

Almost surely, 2^505515161 is an apocalyptic number.

It is an amenable number.

505515161 is a deficient number, since it is larger than the sum of its proper divisors (1).

505515161 is an equidigital number, since it uses as much as digits as its factorization.

505515161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3750, while the sum is 29.

The square root of 505515161 is about 22483.6643143416. The cubic root of 505515161 is about 796.6081189406.

The spelling of 505515161 in words is "five hundred five million, five hundred fifteen thousand, one hundred sixty-one".