554028721 has 4 divisors (see below), whose sum is σ = 554449444. Its totient is φ = 553608000.

The previous prime is 554028701. The next prime is 554028743. The reversal of 554028721 is 127820455.

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 508277025 + 45751696 = 22545^2 + 6764^2 .

It is a cyclic number.

It is not a de Polignac number, because 554028721 - 2¹¹ = 554026673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (554028701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208380 + ... + 211021.

It is an arithmetic number, because the mean of its divisors is an integer number (138612361).

Almost surely, 2^554028721 is an apocalyptic number.

It is an amenable number.

554028721 is a deficient number, since it is larger than the sum of its proper divisors (420723).

554028721 is a wasteful number, since it uses less digits than its factorization.

554028721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420722.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 554028721 is about 23537.8147031537. The cubic root of 554028721 is about 821.3169009098.

The spelling of 554028721 in words is "five hundred fifty-four million, twenty-eight thousand, seven hundred twenty-one".