521531044 has 6 divisors (see below), whose sum is σ = 912679334. Its totient is φ = 260765520.

The previous prime is 521531027. The next prime is 521531093. The reversal of 521531044 is 440135125.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 445632100 + 75898944 = 21110^2 + 8712^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65191377 + ... + 65191384.

Almost surely, 2^521531044 is an apocalyptic number.

It is an amenable number.

521531044 is a deficient number, since it is larger than the sum of its proper divisors (391148290).

521531044 is a wasteful number, since it uses less digits than its factorization.

521531044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130382765 (or 130382763 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 521531044 is about 22837.0541883142. The cubic root of 521531044 is about 804.9335973930.

Adding to 521531044 its reverse (440135125), we get a palindrome (961666169).

The spelling of 521531044 in words is "five hundred twenty-one million, five hundred thirty-one thousand, forty-four".