531021113513 has 16 divisors (see below), whose sum is σ = 621136200960. Its totient is φ = 448598342400.

The previous prime is 531021113507. The next prime is 531021113531. The reversal of 531021113513 is 315311120135.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 531021113513 - 2²⁴ = 531004336297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531021113533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17957918 + ... + 17987463.

It is an arithmetic number, because the mean of its divisors is an integer number (38821012560).

Almost surely, 2^531021113513 is an apocalyptic number.

It is an amenable number.

531021113513 is a deficient number, since it is larger than the sum of its proper divisors (90115087447).

531021113513 is a wasteful number, since it uses less digits than its factorization.

531021113513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35945488.

The product of its (nonzero) digits is 1350, while the sum is 26.

Adding to 531021113513 its reverse (315311120135), we get a palindrome (846332233648).

The spelling of 531021113513 in words is "five hundred thirty-one billion, twenty-one million, one hundred thirteen thousand, five hundred thirteen".