502643161 has 2 divisors, whose sum is σ = 502643162. Its totient is φ = 502643160.

The previous prime is 502643153. The next prime is 502643171. The reversal of 502643161 is 161346205.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492840000 + 9803161 = 22200^2 + 3131^2 .

It is a cyclic number.

It is not a de Polignac number, because 502643161 - 2³ = 502643153 is a prime.

It is not a weakly prime, because it can be changed into another prime (502643101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251321580 + 251321581.

It is an arithmetic number, because the mean of its divisors is an integer number (251321581).

Almost surely, 2^502643161 is an apocalyptic number.

It is an amenable number.

502643161 is a deficient number, since it is larger than the sum of its proper divisors (1).

502643161 is an equidigital number, since it uses as much as digits as its factorization.

502643161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 502643161 is about 22419.7047482789. The cubic root of 502643161 is about 795.0966542559.

Adding to 502643161 its reverse (161346205), we get a palindrome (663989366).

The spelling of 502643161 in words is "five hundred two million, six hundred forty-three thousand, one hundred sixty-one".