556981121 has 2 divisors, whose sum is σ = 556981122. Its totient is φ = 556981120.

The previous prime is 556981111. The next prime is 556981127. The reversal of 556981121 is 121189655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 535228225 + 21752896 = 23135^2 + 4664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556981121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (556981127) 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, 278490560 + 278490561.

It is an arithmetic number, because the mean of its divisors is an integer number (278490561).

Almost surely, 2^556981121 is an apocalyptic number.

It is an amenable number.

556981121 is a deficient number, since it is larger than the sum of its proper divisors (1).

556981121 is an equidigital number, since it uses as much as digits as its factorization.

556981121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 38.

The square root of 556981121 is about 23600.4474745713. The cubic root of 556981121 is about 822.7732402105.

The spelling of 556981121 in words is "five hundred fifty-six million, nine hundred eighty-one thousand, one hundred twenty-one".