553311221 has 4 divisors (see below), whose sum is σ = 553468812. Its totient is φ = 553153632.

The previous prime is 553311197. The next prime is 553311233. The reversal of 553311221 is 122113355.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 308388721 + 244922500 = 17561^2 + 15650^2 .

It is a cyclic number.

It is not a de Polignac number, because 553311221 - 2¹⁴ = 553294837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553311821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73406 + ... + 80591.

It is an arithmetic number, because the mean of its divisors is an integer number (138367203).

Almost surely, 2^553311221 is an apocalyptic number.

It is an amenable number.

553311221 is a deficient number, since it is larger than the sum of its proper divisors (157591).

553311221 is a wasteful number, since it uses less digits than its factorization.

553311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157590.

The product of its digits is 900, while the sum is 23.

The square root of 553311221 is about 23522.5683334112. The cubic root of 553311221 is about 820.9621964045.

Adding to 553311221 its reverse (122113355), we get a palindrome (675424576).

The spelling of 553311221 in words is "five hundred fifty-three million, three hundred eleven thousand, two hundred twenty-one".