531561285521 has 8 divisors (see below), whose sum is σ = 643233824640. Its totient is φ = 428822549568.

The previous prime is 531561285511. The next prime is 531561285527. The reversal of 531561285521 is 125582165135.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 531561285521 - 2¹⁸ = 531561023377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531561285527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2233450661 + ... + 2233450898.

It is an arithmetic number, because the mean of its divisors is an integer number (80404228080).

Almost surely, 2^531561285521 is an apocalyptic number.

It is an amenable number.

531561285521 is a deficient number, since it is larger than the sum of its proper divisors (111672539119).

531561285521 is a wasteful number, since it uses less digits than its factorization.

531561285521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4466901583.

The product of its digits is 360000, while the sum is 44.

The spelling of 531561285521 in words is "five hundred thirty-one billion, five hundred sixty-one million, two hundred eighty-five thousand, five hundred twenty-one".