500161 has 4 divisors (see below), whose sum is σ = 509652. Its totient is φ = 490672.

The previous prime is 500153. The next prime is 500167. The reversal of 500161 is 161005.

500161 = 9² + 10² + ... + 114².

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 323761 + 176400 = 569^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 500161 - 2³ = 500153 is a prime.

It is a super-2 number, since 2×500161² = 500322051842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (500167) 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, 4666 + ... + 4771.

It is an arithmetic number, because the mean of its divisors is an integer number (127413).

2⁵⁰⁰¹⁶¹ is an apocalyptic number.

It is an amenable number.

500161 is a deficient number, since it is larger than the sum of its proper divisors (9491).

500161 is an equidigital number, since it uses as much as digits as its factorization.

500161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9490.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 500161 is about 707.2206162153. The cubic root of 500161 is about 79.3785707365.

Adding to 500161 its reverse (161005), we get a palindrome (661166).

The spelling of 500161 in words is "five hundred thousand, one hundred sixty-one".