531004221 has 16 divisors (see below), whose sum is σ = 858189120. Its totient is φ = 321820560.

The previous prime is 531004219. The next prime is 531004223. The reversal of 531004221 is 122400135.

It is an interprime number because it is at equal distance from previous prime (531004219) and next prime (531004223).

It is not a de Polignac number, because 531004221 - 2¹ = 531004219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 531004194 and 531004203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531004223) 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, 893650 + ... + 894243.

It is an arithmetic number, because the mean of its divisors is an integer number (53636820).

Almost surely, 2^531004221 is an apocalyptic number.

It is an amenable number.

531004221 is a deficient number, since it is larger than the sum of its proper divisors (327184899).

531004221 is a wasteful number, since it uses less digits than its factorization.

531004221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787913 (or 1787907 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 531004221 is about 23043.5288313227. The cubic root of 531004221 is about 809.7780324574.

Adding to 531004221 its reverse (122400135), we get a palindrome (653404356).

The spelling of 531004221 in words is "five hundred thirty-one million, four thousand, two hundred twenty-one".