553721 has 4 divisors (see below), whose sum is σ = 632832. Its totient is φ = 474612.

The previous prime is 553703. The next prime is 553727. The reversal of 553721 is 127355.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127355 = 5 ⋅25471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-553721 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 553721.

It is not an unprimeable number, because it can be changed into a prime (553727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39545 + ... + 39558.

It is an arithmetic number, because the mean of its divisors is an integer number (158208).

2⁵⁵³⁷²¹ is an apocalyptic number.

It is an amenable number.

553721 is a deficient number, since it is larger than the sum of its proper divisors (79111).

553721 is an equidigital number, since it uses as much as digits as its factorization.

553721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79110.

The product of its digits is 1050, while the sum is 23.

The square root of 553721 is about 744.1243175707. The cubic root of 553721 is about 82.1164812968.

The spelling of 553721 in words is "five hundred fifty-three thousand, seven hundred twenty-one".