550155209 has 2 divisors, whose sum is σ = 550155210. Its totient is φ = 550155208.

The previous prime is 550155197. The next prime is 550155217. The reversal of 550155209 is 902551055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499075600 + 51079609 = 22340^2 + 7147^2 .

It is a cyclic number.

It is not a de Polignac number, because 550155209 - 2²⁰ = 549106633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (550155299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275077604 + 275077605.

It is an arithmetic number, because the mean of its divisors is an integer number (275077605).

Almost surely, 2^550155209 is an apocalyptic number.

It is an amenable number.

550155209 is a deficient number, since it is larger than the sum of its proper divisors (1).

550155209 is an equidigital number, since it uses as much as digits as its factorization.

550155209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 32.

The square root of 550155209 is about 23455.3876326954. The cubic root of 550155209 is about 819.3983336764.

The spelling of 550155209 in words is "five hundred fifty million, one hundred fifty-five thousand, two hundred nine".