501532021 has 2 divisors, whose sum is σ = 501532022. Its totient is φ = 501532020.

The previous prime is 501532013. The next prime is 501532067. The reversal of 501532021 is 120235105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375778225 + 125753796 = 19385^2 + 11214^2 .

It is a cyclic number.

It is not a de Polignac number, because 501532021 - 2³ = 501532013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 501532021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501538021) by changing a digit.

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, 250766010 + 250766011.

It is an arithmetic number, because the mean of its divisors is an integer number (250766011).

Almost surely, 2^501532021 is an apocalyptic number.

It is an amenable number.

501532021 is a deficient number, since it is larger than the sum of its proper divisors (1).

501532021 is an equidigital number, since it uses as much as digits as its factorization.

501532021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 501532021 is about 22394.9106048673. The cubic root of 501532021 is about 794.5103433573.

Adding to 501532021 its reverse (120235105), we get a palindrome (621767126).

The spelling of 501532021 in words is "five hundred one million, five hundred thirty-two thousand, twenty-one".