550021531 has 2 divisors, whose sum is σ = 550021532. Its totient is φ = 550021530.

The previous prime is 550021501. The next prime is 550021543. The reversal of 550021531 is 135120055.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 550021531 - 2⁷ = 550021403 is a prime.

It is a super-2 number, since 2×550021531² = 605047369127167922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (550021501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275010765 + 275010766.

It is an arithmetic number, because the mean of its divisors is an integer number (275010766).

Almost surely, 2^550021531 is an apocalyptic number.

550021531 is a deficient number, since it is larger than the sum of its proper divisors (1).

550021531 is an equidigital number, since it uses as much as digits as its factorization.

550021531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 550021531 is about 23452.5378370871. The cubic root of 550021531 is about 819.3319618589.

Adding to 550021531 its reverse (135120055), we get a palindrome (685141586).

The spelling of 550021531 in words is "five hundred fifty million, twenty-one thousand, five hundred thirty-one".