503040642521 has 8 divisors (see below), whose sum is σ = 509300934024. Its totient is φ = 496805443200.

The previous prime is 503040642487. The next prime is 503040642523. The reversal of 503040642521 is 125246040305.

It can be written as a sum of positive squares in 4 ways, for example, as 397106666896 + 105933975625 = 630164^2 + 325475^2 .

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 503040642521 - 2⁶ = 503040642457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (503040642523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6232700 + ... + 6312893.

It is an arithmetic number, because the mean of its divisors is an integer number (63662616753).

Almost surely, 2^503040642521 is an apocalyptic number.

It is an amenable number.

503040642521 is a deficient number, since it is larger than the sum of its proper divisors (6260291503).

503040642521 is a wasteful number, since it uses less digits than its factorization.

503040642521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12546091.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 503040642521 its reverse (125246040305), we get a palindrome (628286682826).

The spelling of 503040642521 in words is "five hundred three billion, forty million, six hundred forty-two thousand, five hundred twenty-one".