556123289 has 2 divisors, whose sum is σ = 556123290. Its totient is φ = 556123288.

The previous prime is 556123259. The next prime is 556123297. The reversal of 556123289 is 982321655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 457617664 + 98505625 = 21392^2 + 9925^2 .

It is a cyclic number.

It is not a de Polignac number, because 556123289 - 2⁸ = 556123033 is a prime.

It is a super-2 number, since 2×556123289² = 618546225136355042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (556123219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278061644 + 278061645.

It is an arithmetic number, because the mean of its divisors is an integer number (278061645).

Almost surely, 2^556123289 is an apocalyptic number.

It is an amenable number.

556123289 is a deficient number, since it is larger than the sum of its proper divisors (1).

556123289 is an equidigital number, since it uses as much as digits as its factorization.

556123289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 556123289 is about 23582.2664093170. The cubic root of 556123289 is about 822.3506263232.

The spelling of 556123289 in words is "five hundred fifty-six million, one hundred twenty-three thousand, two hundred eighty-nine".