505111161 has 16 divisors (see below), whose sum is σ = 692755200. Its totient is φ = 327132288.

The previous prime is 505111133. The next prime is 505111207. The reversal of 505111161 is 161111505.

It is a happy number.

It is not a de Polignac number, because 505111161 - 2⁶ = 505111097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (505111261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76645 + ... + 82973.

It is an arithmetic number, because the mean of its divisors is an integer number (43297200).

Almost surely, 2^505111161 is an apocalyptic number.

It is an amenable number.

505111161 is a deficient number, since it is larger than the sum of its proper divisors (187644039).

505111161 is a wasteful number, since it uses less digits than its factorization.

505111161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088.

The product of its (nonzero) digits is 150, while the sum is 21.

The square root of 505111161 is about 22474.6782179412. The cubic root of 505111161 is about 796.3958500337.

Adding to 505111161 its reverse (161111505), we get a palindrome (666222666).

The spelling of 505111161 in words is "five hundred five million, one hundred eleven thousand, one hundred sixty-one".