503161 has 4 divisors (see below), whose sum is σ = 519424. Its totient is φ = 486900.

The previous prime is 503159. The next prime is 503197. The reversal of 503161 is 161305.

503161 = T₅₄ + T₅₅ + ... + T₁₄₆.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161305 = 5 ⋅32261.

It is a cyclic number.

It is not a de Polignac number, because 503161 - 2¹ = 503159 is a prime.

It is a Duffinian number.

503161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (503131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8085 + ... + 8146.

It is an arithmetic number, because the mean of its divisors is an integer number (129856).

2⁵⁰³¹⁶¹ is an apocalyptic number.

It is an amenable number.

503161 is a deficient number, since it is larger than the sum of its proper divisors (16263).

503161 is a wasteful number, since it uses less digits than its factorization.

503161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16262.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 503161 is about 709.3384241672. The cubic root of 503161 is about 79.5369605179.

Adding to 503161 its reverse (161305), we get a palindrome (664466).

The spelling of 503161 in words is "five hundred three thousand, one hundred sixty-one".