555743921 has 2 divisors, whose sum is σ = 555743922. Its totient is φ = 555743920.

The previous prime is 555743893. The next prime is 555744031. The reversal of 555743921 is 129347555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311134321 + 244609600 = 17639^2 + 15640^2 .

It is a cyclic number.

It is not a de Polignac number, because 555743921 - 2¹⁴ = 555727537 is a prime.

It is not a weakly prime, because it can be changed into another prime (555749921) 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 as a sum of consecutive naturals, namely, 277871960 + 277871961.

It is an arithmetic number, because the mean of its divisors is an integer number (277871961).

Almost surely, 2^555743921 is an apocalyptic number.

It is an amenable number.

555743921 is a deficient number, since it is larger than the sum of its proper divisors (1).

555743921 is an equidigital number, since it uses as much as digits as its factorization.

555743921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 41.

The square root of 555743921 is about 23574.2215353975. The cubic root of 555743921 is about 822.1635907716.

It can be divided in two parts, 55574 and 3921, that added together give a palindrome (59495).

The spelling of 555743921 in words is "five hundred fifty-five million, seven hundred forty-three thousand, nine hundred twenty-one".