556033721 has 2 divisors, whose sum is σ = 556033722. Its totient is φ = 556033720.

The previous prime is 556033697. The next prime is 556033769. The reversal of 556033721 is 127330655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522625321 + 33408400 = 22861^2 + 5780^2 .

It is a cyclic number.

It is not a de Polignac number, because 556033721 - 2⁶ = 556033657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (556033321) 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 as a sum of consecutive naturals, namely, 278016860 + 278016861.

It is an arithmetic number, because the mean of its divisors is an integer number (278016861).

Almost surely, 2^556033721 is an apocalyptic number.

It is an amenable number.

556033721 is a deficient number, since it is larger than the sum of its proper divisors (1).

556033721 is an equidigital number, since it uses as much as digits as its factorization.

556033721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 32.

The square root of 556033721 is about 23580.3672787342. The cubic root of 556033721 is about 822.3064752887.

The spelling of 556033721 in words is "five hundred fifty-six million, thirty-three thousand, seven hundred twenty-one".