505443161 has 2 divisors, whose sum is σ = 505443162. Its totient is φ = 505443160.

The previous prime is 505443151. The next prime is 505443179. The reversal of 505443161 is 161344505.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 482065936 + 23377225 = 21956^2 + 4835^2 .

It is a cyclic number.

It is not a de Polignac number, because 505443161 - 2²⁶ = 438334297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505443151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252721580 + 252721581.

It is an arithmetic number, because the mean of its divisors is an integer number (252721581).

Almost surely, 2^505443161 is an apocalyptic number.

It is an amenable number.

505443161 is a deficient number, since it is larger than the sum of its proper divisors (1).

505443161 is an equidigital number, since it uses as much as digits as its factorization.

505443161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 505443161 is about 22482.0630948318. The cubic root of 505443161 is about 796.5702971223.

Adding to 505443161 its reverse (161344505), we get a palindrome (666787666).

The spelling of 505443161 in words is "five hundred five million, four hundred forty-three thousand, one hundred sixty-one".