531721732 has 6 divisors (see below), whose sum is σ = 930513038. Its totient is φ = 265860864.

The previous prime is 531721727. The next prime is 531721739. The reversal of 531721732 is 237127135.

It can be written as a sum of positive squares in only one way, i.e., 307441156 + 224280576 = 17534^2 + 14976^2 .

It is a junction number, because it is equal to n+sod(n) for n = 531721694 and 531721703.

It is not an unprimeable number, because it can be changed into a prime (531721739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66465213 + ... + 66465220.

Almost surely, 2^531721732 is an apocalyptic number.

It is an amenable number.

531721732 is a deficient number, since it is larger than the sum of its proper divisors (398791306).

531721732 is a wasteful number, since it uses less digits than its factorization.

531721732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132930437 (or 132930435 counting only the distinct ones).

The product of its digits is 8820, while the sum is 31.

The square root of 531721732 is about 23059.0921764063. The cubic root of 531721732 is about 810.1426015255.

Adding to 531721732 its reverse (237127135), we get a palindrome (768848867).

The spelling of 531721732 in words is "five hundred thirty-one million, seven hundred twenty-one thousand, seven hundred thirty-two".