531505217 has 8 divisors (see below), whose sum is σ = 541507680. Its totient is φ = 521536000.

The previous prime is 531505213. The next prime is 531505277. The reversal of 531505217 is 712505135.

It is a happy number.

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 531505217 - 2² = 531505213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531505217.

It is not an unprimeable number, because it can be changed into a prime (531505211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25217 + ... + 41217.

It is an arithmetic number, because the mean of its divisors is an integer number (67688460).

Almost surely, 2^531505217 is an apocalyptic number.

It is an amenable number.

531505217 is a deficient number, since it is larger than the sum of its proper divisors (10002463).

531505217 is a wasteful number, since it uses less digits than its factorization.

531505217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16623.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 531505217 is about 23054.3969125197. The cubic root of 531505217 is about 810.0326243020.

The spelling of 531505217 in words is "five hundred thirty-one million, five hundred five thousand, two hundred seventeen".