531604821 has 16 divisors (see below), whose sum is σ = 773637120. Its totient is φ = 322020720.

The previous prime is 531604769. The next prime is 531604831. The reversal of 531604821 is 128406135.

It is not a de Polignac number, because 531604821 - 2⁷ = 531604693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531604831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105076 + ... + 110018.

It is an arithmetic number, because the mean of its divisors is an integer number (48352320).

Almost surely, 2^531604821 is an apocalyptic number.

It is an amenable number.

531604821 is a deficient number, since it is larger than the sum of its proper divisors (242032299).

531604821 is a wasteful number, since it uses less digits than its factorization.

531604821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8216.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 531604821 is about 23056.5570066305. The cubic root of 531604821 is about 810.0832211400.

The spelling of 531604821 in words is "five hundred thirty-one million, six hundred four thousand, eight hundred twenty-one".