550538 has 4 divisors (see below), whose sum is σ = 825810. Its totient is φ = 275268.

The previous prime is 550531. The next prime is 550541. The reversal of 550538 is 835055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 388129 + 162409 = 623^2 + 403^2 .

It is an Ulam number.

It is a plaindrome in base 11.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 550538.

It is not an unprimeable number, because it can be changed into a prime (550531) by changing a digit.

550538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137633 + ... + 137636.

2⁵⁵⁰⁵³⁸ is an apocalyptic number.

550538 is a deficient number, since it is larger than the sum of its proper divisors (275272).

550538 is a wasteful number, since it uses less digits than its factorization.

550538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275271.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 550538 is about 741.9824795775. The cubic root of 550538 is about 81.9588331931.

Adding to 550538 its sum of digits (26), we get a square (550564 = 742²).

The spelling of 550538 in words is "five hundred fifty thousand, five hundred thirty-eight".