531323130421 has 2 divisors, whose sum is σ = 531323130422. Its totient is φ = 531323130420.

The previous prime is 531323130391. The next prime is 531323130449. The reversal of 531323130421 is 124031323135.

It is an a-pointer prime, because the next prime (531323130449) can be obtained adding 531323130421 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311826195396 + 219496935025 = 558414^2 + 468505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531323130421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 531323130421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531323130461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265661565210 + 265661565211.

It is an arithmetic number, because the mean of its divisors is an integer number (265661565211).

Almost surely, 2^531323130421 is an apocalyptic number.

It is an amenable number.

531323130421 is a deficient number, since it is larger than the sum of its proper divisors (1).

531323130421 is an equidigital number, since it uses as much as digits as its factorization.

531323130421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 531323130421 its reverse (124031323135), we get a palindrome (655354453556).

The spelling of 531323130421 in words is "five hundred thirty-one billion, three hundred twenty-three million, one hundred thirty thousand, four hundred twenty-one".