550001 has 4 divisors (see below), whose sum is σ = 582372. Its totient is φ = 517632.

The previous prime is 549979. The next prime is 550007. The reversal of 550001 is 100055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100055 = 5 ⋅20011.

It can be written as a sum of positive squares in 2 ways, for example, as 456976 + 93025 = 676^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 550001 - 2⁶ = 549937 is a prime.

It is a super-2 number, since 2×550001² = 605002200002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16160 + ... + 16193.

It is an arithmetic number, because the mean of its divisors is an integer number (145593).

2⁵⁵⁰⁰⁰¹ is an apocalyptic number.

It is an amenable number.

550001 is a deficient number, since it is larger than the sum of its proper divisors (32371).

550001 is a wasteful number, since it uses less digits than its factorization.

550001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32370.

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

The square root of 550001 is about 741.6205229091. The cubic root of 550001 is about 81.9321767159.

Adding to 550001 its reverse (100055), we get a palindrome (650056).

The spelling of 550001 in words is "five hundred fifty thousand, one".