531321312505 has 8 divisors (see below), whose sum is σ = 637605996552. Its totient is φ = 425043435648.

The previous prime is 531321312497. The next prime is 531321312527. The reversal of 531321312505 is 505213123135.

It can be written as a sum of positive squares in 4 ways, for example, as 342398016 + 530978914489 = 18504^2 + 728683^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 531321312505 - 2³ = 531321312497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1528474 + ... + 1843603.

It is an arithmetic number, because the mean of its divisors is an integer number (79700749569).

Almost surely, 2^531321312505 is an apocalyptic number.

It is an amenable number.

531321312505 is a deficient number, since it is larger than the sum of its proper divisors (106284684047).

531321312505 is a wasteful number, since it uses less digits than its factorization.

531321312505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3403595.

The product of its (nonzero) digits is 13500, while the sum is 31.

The spelling of 531321312505 in words is "five hundred thirty-one billion, three hundred twenty-one million, three hundred twelve thousand, five hundred five".