515161 has 4 divisors (see below), whose sum is σ = 522292. Its totient is φ = 508032.

The previous prime is 515153. The next prime is 515173. The reversal of 515161 is 161515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161515 = 5 ⋅32303.

It can be written as a sum of positive squares in 2 ways, for example, as 447561 + 67600 = 669^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 515161 - 2³ = 515153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (515111) 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, 3456 + ... + 3601.

It is an arithmetic number, because the mean of its divisors is an integer number (130573).

2⁵¹⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

515161 is a deficient number, since it is larger than the sum of its proper divisors (7131).

515161 is an equidigital number, since it uses as much as digits as its factorization.

515161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7130.

The product of its digits is 150, while the sum is 19.

The square root of 515161 is about 717.7471699700. The cubic root of 515161 is about 80.1642977637.

Adding to 515161 its reverse (161515), we get a palindrome (676676).

It can be divided in two parts, 515 and 161, that added together give a palindrome (676).

The spelling of 515161 in words is "five hundred fifteen thousand, one hundred sixty-one".