531534340251491 has 2 divisors, whose sum is σ = 531534340251492. Its totient is φ = 531534340251490.

The previous prime is 531534340251469. The next prime is 531534340251637. The reversal of 531534340251491 is 194152043435135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531534340251491 - 2¹⁰ = 531534340250467 is a prime.

It is not a weakly prime, because it can be changed into another prime (531534340257491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265767170125745 + 265767170125746.

It is an arithmetic number, because the mean of its divisors is an integer number (265767170125746).

Almost surely, 2^{531534340251491} is an apocalyptic number.

531534340251491 is a deficient number, since it is larger than the sum of its proper divisors (1).

531534340251491 is an equidigital number, since it uses as much as digits as its factorization.

531534340251491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 531534340251491 in words is "five hundred thirty-one trillion, five hundred thirty-four billion, three hundred forty million, two hundred fifty-one thousand, four hundred ninety-one".