531215985 has 16 divisors (see below), whose sum is σ = 852270336. Its totient is φ = 282540288.

The previous prime is 531215959. The next prime is 531216029. The reversal of 531215985 is 589512135.

It is not a de Polignac number, because 531215985 - 2⁷ = 531215857 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42744 + ... + 53753.

It is an arithmetic number, because the mean of its divisors is an integer number (53266896).

Almost surely, 2^531215985 is an apocalyptic number.

It is an amenable number.

531215985 is a deficient number, since it is larger than the sum of its proper divisors (321054351).

531215985 is a wasteful number, since it uses less digits than its factorization.

531215985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96872.

The product of its digits is 54000, while the sum is 39.

The square root of 531215985 is about 23048.1232424681. The cubic root of 531215985 is about 809.8856643982.

The spelling of 531215985 in words is "five hundred thirty-one million, two hundred fifteen thousand, nine hundred eighty-five".