506165161 has 4 divisors (see below), whose sum is σ = 511852500. Its totient is φ = 500477824.

The previous prime is 506165119. The next prime is 506165167. The reversal of 506165161 is 161561605.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 294637225 + 211527936 = 17165^2 + 14544^2 .

It is a cyclic number.

It is not a de Polignac number, because 506165161 - 2⁹ = 506164649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506165167) 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, 2843536 + ... + 2843713.

It is an arithmetic number, because the mean of its divisors is an integer number (127963125).

Almost surely, 2^506165161 is an apocalyptic number.

It is an amenable number.

506165161 is a deficient number, since it is larger than the sum of its proper divisors (5687339).

506165161 is an equidigital number, since it uses as much as digits as its factorization.

506165161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5687338.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 506165161 is about 22498.1146098956. The cubic root of 506165161 is about 796.9494034662.

The spelling of 506165161 in words is "five hundred six million, one hundred sixty-five thousand, one hundred sixty-one".