531323122261 has 2 divisors, whose sum is σ = 531323122262. Its totient is φ = 531323122260.

The previous prime is 531323122243. The next prime is 531323122327. The reversal of 531323122261 is 162221323135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352977386161 + 178345736100 = 594119^2 + 422310^2 .

It is a cyclic number.

It is not a de Polignac number, because 531323122261 - 2²⁵ = 531289567829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531323122241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265661561130 + 265661561131.

It is an arithmetic number, because the mean of its divisors is an integer number (265661561131).

Almost surely, 2^531323122261 is an apocalyptic number.

It is an amenable number.

531323122261 is a deficient number, since it is larger than the sum of its proper divisors (1).

531323122261 is an equidigital number, since it uses as much as digits as its factorization.

531323122261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

Adding to 531323122261 its reverse (162221323135), we get a palindrome (693544445396).

The spelling of 531323122261 in words is "five hundred thirty-one billion, three hundred twenty-three million, one hundred twenty-two thousand, two hundred sixty-one".