531161 has 4 divisors (see below), whose sum is σ = 533172. Its totient is φ = 529152.

The previous prime is 531143. The next prime is 531163. The reversal of 531161 is 161135.

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 235225 + 295936 = 485^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 531161 - 2¹⁰ = 530137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531163) 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, 536 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (133293).

2⁵³¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

531161 is a deficient number, since it is larger than the sum of its proper divisors (2011).

531161 is a wasteful number, since it uses less digits than its factorization.

531161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010.

The product of its digits is 90, while the sum is 17.

The square root of 531161 is about 728.8079308021. The cubic root of 531161 is about 80.9857720272.

Adding to 531161 its reverse (161135), we get a palindrome (692296).

It can be divided in two parts, 531 and 161, that multiplied together give a triangular number (85491 = T₄₁₃).

The spelling of 531161 in words is "five hundred thirty-one thousand, one hundred sixty-one".