556998621 has 16 divisors (see below), whose sum is σ = 779103360. Its totient is φ = 353474240.

The previous prime is 556998599. The next prime is 556998667. The reversal of 556998621 is 126899655.

It is a cyclic number.

It is not a de Polignac number, because 556998621 - 2⁷ = 556998493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556997621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38910 + ... + 51263.

It is an arithmetic number, because the mean of its divisors is an integer number (48693960).

Almost surely, 2^556998621 is an apocalyptic number.

It is an amenable number.

556998621 is a deficient number, since it is larger than the sum of its proper divisors (222104739).

556998621 is a wasteful number, since it uses less digits than its factorization.

556998621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90276.

The product of its digits is 1166400, while the sum is 51.

The square root of 556998621 is about 23600.8182273412. The cubic root of 556998621 is about 822.7818571279.

The spelling of 556998621 in words is "five hundred fifty-six million, nine hundred ninety-eight thousand, six hundred twenty-one".