556746389 has 2 divisors, whose sum is σ = 556746390. Its totient is φ = 556746388.

The previous prime is 556746371. The next prime is 556746401. The reversal of 556746389 is 983647655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437019025 + 119727364 = 20905^2 + 10942^2 .

It is a cyclic number.

It is not a de Polignac number, because 556746389 - 2¹⁶ = 556680853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 556746389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556740389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278373194 + 278373195.

It is an arithmetic number, because the mean of its divisors is an integer number (278373195).

Almost surely, 2^556746389 is an apocalyptic number.

It is an amenable number.

556746389 is a deficient number, since it is larger than the sum of its proper divisors (1).

556746389 is an equidigital number, since it uses as much as digits as its factorization.

556746389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 53.

The square root of 556746389 is about 23595.4739092056. The cubic root of 556746389 is about 822.6576418308.

The spelling of 556746389 in words is "five hundred fifty-six million, seven hundred forty-six thousand, three hundred eighty-nine".