531362721 has 32 divisors (see below), whose sum is σ = 781056000. Its totient is φ = 319828608.

The previous prime is 531362707. The next prime is 531362743. The reversal of 531362721 is 127263135.

It is not a de Polignac number, because 531362721 - 2¹¹ = 531360673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531362021) 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 31 ways as a sum of consecutive naturals, for example, 470085 + ... + 471213.

It is an arithmetic number, because the mean of its divisors is an integer number (24408000).

Almost surely, 2^531362721 is an apocalyptic number.

It is an amenable number.

531362721 is a deficient number, since it is larger than the sum of its proper divisors (249693279).

531362721 is a wasteful number, since it uses less digits than its factorization.

531362721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533.

The product of its digits is 7560, while the sum is 30.

The square root of 531362721 is about 23051.3062753502. The cubic root of 531362721 is about 809.9602281950.

The spelling of 531362721 in words is "five hundred thirty-one million, three hundred sixty-two thousand, seven hundred twenty-one".