531511247321 has 4 divisors (see below), whose sum is σ = 542819997312. Its totient is φ = 520202497332.

The previous prime is 531511247269. The next prime is 531511247327. The reversal of 531511247321 is 123742115135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 531511247321 - 2¹⁰ = 531511246297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531511247327) 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 in 3 ways as a sum of consecutive naturals, for example, 5654374925 + ... + 5654375018.

It is an arithmetic number, because the mean of its divisors is an integer number (135704999328).

Almost surely, 2^531511247321 is an apocalyptic number.

It is an amenable number.

531511247321 is a deficient number, since it is larger than the sum of its proper divisors (11308749991).

531511247321 is a wasteful number, since it uses less digits than its factorization.

531511247321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11308749990.

The product of its digits is 25200, while the sum is 35.

The spelling of 531511247321 in words is "five hundred thirty-one billion, five hundred eleven million, two hundred forty-seven thousand, three hundred twenty-one".