553705721 has 4 divisors (see below), whose sum is σ = 558785700. Its totient is φ = 548625744.

The previous prime is 553705693. The next prime is 553705727. The reversal of 553705721 is 127507355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127507355 = 5 ⋅25501471.

It can be written as a sum of positive squares in 2 ways, for example, as 170955625 + 382750096 = 13075^2 + 19564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-553705721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (553705727) 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, 2539826 + ... + 2540043.

It is an arithmetic number, because the mean of its divisors is an integer number (139696425).

Almost surely, 2^553705721 is an apocalyptic number.

It is an amenable number.

553705721 is a deficient number, since it is larger than the sum of its proper divisors (5079979).

553705721 is a wasteful number, since it uses less digits than its factorization.

553705721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5079978.

The product of its (nonzero) digits is 36750, while the sum is 35.

The square root of 553705721 is about 23530.9524031646. The cubic root of 553705721 is about 821.1572600106.

The spelling of 553705721 in words is "five hundred fifty-three million, seven hundred five thousand, seven hundred twenty-one".