556251217 has 2 divisors, whose sum is σ = 556251218. Its totient is φ = 556251216.

The previous prime is 556251161. The next prime is 556251221. The reversal of 556251217 is 712152655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553613841 + 2637376 = 23529^2 + 1624^2 .

It is a cyclic number.

It is not a de Polignac number, because 556251217 - 2¹⁵ = 556218449 is a prime.

It is not a weakly prime, because it can be changed into another prime (556251287) 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, 278125608 + 278125609.

It is an arithmetic number, because the mean of its divisors is an integer number (278125609).

Almost surely, 2^556251217 is an apocalyptic number.

It is an amenable number.

556251217 is a deficient number, since it is larger than the sum of its proper divisors (1).

556251217 is an equidigital number, since it uses as much as digits as its factorization.

556251217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 34.

The square root of 556251217 is about 23584.9786304758. The cubic root of 556251217 is about 822.4136780526.

The spelling of 556251217 in words is "five hundred fifty-six million, two hundred fifty-one thousand, two hundred seventeen".