531534221 has 4 divisors (see below), whose sum is σ = 531584700. Its totient is φ = 531483744.

The previous prime is 531534181. The next prime is 531534239. The reversal of 531534221 is 122435135.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 122435135 = 5 ⋅24487027.

It can be written as a sum of positive squares in 2 ways, for example, as 16924996 + 514609225 = 4114^2 + 22685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531534221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531536221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2786 + ... + 32723.

It is an arithmetic number, because the mean of its divisors is an integer number (132896175).

Almost surely, 2^531534221 is an apocalyptic number.

It is an amenable number.

531534221 is a deficient number, since it is larger than the sum of its proper divisors (50479).

531534221 is a wasteful number, since it uses less digits than its factorization.

531534221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50478.

The product of its digits is 3600, while the sum is 26.

The square root of 531534221 is about 23055.0259379598. The cubic root of 531534221 is about 810.0473584057.

Adding to 531534221 its reverse (122435135), we get a palindrome (653969356).

The spelling of 531534221 in words is "five hundred thirty-one million, five hundred thirty-four thousand, two hundred twenty-one".