551520217 has 2 divisors, whose sum is σ = 551520218. Its totient is φ = 551520216.

The previous prime is 551520199. The next prime is 551520227. The reversal of 551520217 is 712025155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396368281 + 155151936 = 19909^2 + 12456^2 .

It is a cyclic number.

It is not a de Polignac number, because 551520217 - 2⁷ = 551520089 is a prime.

It is not a weakly prime, because it can be changed into another prime (551520227) 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, 275760108 + 275760109.

It is an arithmetic number, because the mean of its divisors is an integer number (275760109).

Almost surely, 2^551520217 is an apocalyptic number.

It is an amenable number.

551520217 is a deficient number, since it is larger than the sum of its proper divisors (1).

551520217 is an equidigital number, since it uses as much as digits as its factorization.

551520217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 551520217 is about 23484.4675690125. The cubic root of 551520217 is about 820.0754526049.

The spelling of 551520217 in words is "five hundred fifty-one million, five hundred twenty thousand, two hundred seventeen".