553621 has 4 divisors (see below), whose sum is σ = 561952. Its totient is φ = 545292.

The previous prime is 553607. The next prime is 553627. The reversal of 553621 is 126355.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 553621 - 2⁵ = 553589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 553592 and 553601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553627) 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, 4065 + ... + 4198.

It is an arithmetic number, because the mean of its divisors is an integer number (140488).

2⁵⁵³⁶²¹ is an apocalyptic number.

It is an amenable number.

553621 is a deficient number, since it is larger than the sum of its proper divisors (8331).

553621 is an equidigital number, since it uses as much as digits as its factorization.

553621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8330.

The product of its digits is 900, while the sum is 22.

The square root of 553621 is about 744.0571214631. The cubic root of 553621 is about 82.1115376865. Note that the first 3 decimals are identical.

Adding to 553621 its reverse (126355), we get a palindrome (679976).

The spelling of 553621 in words is "five hundred fifty-three thousand, six hundred twenty-one".