505615161 has 4 divisors (see below), whose sum is σ = 674153552. Its totient is φ = 337076772.

The previous prime is 505615129. The next prime is 505615169. The reversal of 505615161 is 161516505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 505615161 - 2⁵ = 505615129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505615169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84269191 + ... + 84269196.

It is an arithmetic number, because the mean of its divisors is an integer number (168538388).

Almost surely, 2^505615161 is an apocalyptic number.

It is an amenable number.

505615161 is a deficient number, since it is larger than the sum of its proper divisors (168538391).

505615161 is a wasteful number, since it uses less digits than its factorization.

505615161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168538390.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 505615161 is about 22485.8880411693. Note that the first 3 decimals coincide. The cubic root of 505615161 is about 796.6606432866.

The spelling of 505615161 in words is "five hundred five million, six hundred fifteen thousand, one hundred sixty-one".