556788989 has 2 divisors, whose sum is σ = 556788990. Its totient is φ = 556788988.

The previous prime is 556788941. The next prime is 556789003. The reversal of 556788989 is 989887655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 552955225 + 3833764 = 23515^2 + 1958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556788989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556788289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278394494 + 278394495.

It is an arithmetic number, because the mean of its divisors is an integer number (278394495).

Almost surely, 2^556788989 is an apocalyptic number.

It is an amenable number.

556788989 is a deficient number, since it is larger than the sum of its proper divisors (1).

556788989 is an equidigital number, since it uses as much as digits as its factorization.

556788989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43545600, while the sum is 65.

The square root of 556788989 is about 23596.3766074370. The cubic root of 556788989 is about 822.6786234497.

The spelling of 556788989 in words is "five hundred fifty-six million, seven hundred eighty-eight thousand, nine hundred eighty-nine".