503120161 has 4 divisors (see below), whose sum is σ = 510012292. Its totient is φ = 496228032.

The previous prime is 503120153. The next prime is 503120179. The reversal of 503120161 is 161021305.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161021305 = 5 ⋅32204261.

It can be written as a sum of positive squares in 2 ways, for example, as 270405136 + 232715025 = 16444^2 + 15255^2 .

It is a cyclic number.

It is not a de Polignac number, because 503120161 - 2³ = 503120153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (503120461) 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, 3445956 + ... + 3446101.

It is an arithmetic number, because the mean of its divisors is an integer number (127503073).

Almost surely, 2^503120161 is an apocalyptic number.

It is an amenable number.

503120161 is a deficient number, since it is larger than the sum of its proper divisors (6892131).

503120161 is an equidigital number, since it uses as much as digits as its factorization.

503120161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6892130.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 503120161 is about 22430.3401891278. The cubic root of 503120161 is about 795.3480859049.

Adding to 503120161 its reverse (161021305), we get a palindrome (664141466).

The spelling of 503120161 in words is "five hundred three million, one hundred twenty thousand, one hundred sixty-one".