531018161 has 2 divisors, whose sum is σ = 531018162. Its totient is φ = 531018160.

The previous prime is 531018151. The next prime is 531018193. The reversal of 531018161 is 161810135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522351025 + 8667136 = 22855^2 + 2944^2 .

It is a cyclic number.

It is not a de Polignac number, because 531018161 - 2⁶ = 531018097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 531018161.

It is not a weakly prime, because it can be changed into another prime (531018151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265509080 + 265509081.

It is an arithmetic number, because the mean of its divisors is an integer number (265509081).

Almost surely, 2^531018161 is an apocalyptic number.

It is an amenable number.

531018161 is a deficient number, since it is larger than the sum of its proper divisors (1).

531018161 is an equidigital number, since it uses as much as digits as its factorization.

531018161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 531018161 is about 23043.8313003719. The cubic root of 531018161 is about 809.7851185322.

Adding to 531018161 its reverse (161810135), we get a palindrome (692828296).

The spelling of 531018161 in words is "five hundred thirty-one million, eighteen thousand, one hundred sixty-one".