531402161 has 2 divisors, whose sum is σ = 531402162. Its totient is φ = 531402160.

The previous prime is 531402077. The next prime is 531402169. The reversal of 531402161 is 161204135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514427761 + 16974400 = 22681^2 + 4120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531402161 is a prime.

It is not a weakly prime, because it can be changed into another prime (531402169) 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, 265701080 + 265701081.

It is an arithmetic number, because the mean of its divisors is an integer number (265701081).

Almost surely, 2^531402161 is an apocalyptic number.

It is an amenable number.

531402161 is a deficient number, since it is larger than the sum of its proper divisors (1).

531402161 is an equidigital number, since it uses as much as digits as its factorization.

531402161 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 23.

The square root of 531402161 is about 23052.1617424484. The cubic root of 531402161 is about 809.9802672630.

Adding to 531402161 its reverse (161204135), we get a palindrome (692606296).

The spelling of 531402161 in words is "five hundred thirty-one million, four hundred two thousand, one hundred sixty-one".