549406217 has 2 divisors, whose sum is σ = 549406218. Its totient is φ = 549406216.

The previous prime is 549406213. The next prime is 549406241. The reversal of 549406217 is 712604945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349353481 + 200052736 = 18691^2 + 14144^2 .

It is a cyclic number.

It is not a de Polignac number, because 549406217 - 2² = 549406213 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (549406213) 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, 274703108 + 274703109.

It is an arithmetic number, because the mean of its divisors is an integer number (274703109).

Almost surely, 2^549406217 is an apocalyptic number.

It is an amenable number.

549406217 is a deficient number, since it is larger than the sum of its proper divisors (1).

549406217 is an equidigital number, since it uses as much as digits as its factorization.

549406217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 549406217 is about 23439.4158843603. The cubic root of 549406217 is about 819.0263165262.

The spelling of 549406217 in words is "five hundred forty-nine million, four hundred six thousand, two hundred seventeen".