531120421 has 8 divisors (see below), whose sum is σ = 572877144. Its totient is φ = 489492480.

The previous prime is 531120383. The next prime is 531120431. The reversal of 531120421 is 124021135.

It can be written as a sum of positive squares in 4 ways, for example, as 1476225 + 529644196 = 1215^2 + 23014^2 .

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 531120421 - 2¹³ = 531112229 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 (531120431) 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, 23536 + ... + 40201.

It is an arithmetic number, because the mean of its divisors is an integer number (71609643).

Almost surely, 2^531120421 is an apocalyptic number.

It is an amenable number.

531120421 is a deficient number, since it is larger than the sum of its proper divisors (41756723).

531120421 is a wasteful number, since it uses less digits than its factorization.

531120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64391.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 531120421 is about 23046.0500086240. The cubic root of 531120421 is about 809.8370962342.

Adding to 531120421 its reverse (124021135), we get a palindrome (655141556).

The spelling of 531120421 in words is "five hundred thirty-one million, one hundred twenty thousand, four hundred twenty-one".