550000001 has 2 divisors, whose sum is σ = 550000002. Its totient is φ = 550000000.

The previous prime is 549999959. The next prime is 550000007. The reversal of 550000001 is 100000055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549855601 + 144400 = 23449^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 550000001 - 2⁶ = 549999937 is a prime.

It is a super-2 number, since 2×550000001² = 605000002200000002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (550000007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275000000 + 275000001.

It is an arithmetic number, because the mean of its divisors is an integer number (275000001).

Almost surely, 2^550000001 is an apocalyptic number.

It is an amenable number.

550000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

550000001 is an equidigital number, since it uses as much as digits as its factorization.

550000001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25, while the sum is 11.

The square root of 550000001 is about 23452.0788204372. The cubic root of 550000001 is about 819.3212710972.

Adding to 550000001 its reverse (100000055), we get a palindrome (650000056).

The spelling of 550000001 in words is "five hundred fifty million, one", and thus it is an aban number.