531323130391 has 2 divisors, whose sum is σ = 531323130392. Its totient is φ = 531323130390.

The previous prime is 531323130383. The next prime is 531323130421. The reversal of 531323130391 is 193031323135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531323130391 - 2³ = 531323130383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531323136391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265661565195 + 265661565196.

It is an arithmetic number, because the mean of its divisors is an integer number (265661565196).

Almost surely, 2^531323130391 is an apocalyptic number.

531323130391 is a deficient number, since it is larger than the sum of its proper divisors (1).

531323130391 is an equidigital number, since it uses as much as digits as its factorization.

531323130391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 34.

The spelling of 531323130391 in words is "five hundred thirty-one billion, three hundred twenty-three million, one hundred thirty thousand, three hundred ninety-one".