556771549 has 2 divisors, whose sum is σ = 556771550. Its totient is φ = 556771548.

The previous prime is 556771507. The next prime is 556771559. The reversal of 556771549 is 945177655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 556724025 + 47524 = 23595^2 + 218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556771549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556771559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278385774 + 278385775.

It is an arithmetic number, because the mean of its divisors is an integer number (278385775).

Almost surely, 2^556771549 is an apocalyptic number.

It is an amenable number.

556771549 is a deficient number, since it is larger than the sum of its proper divisors (1).

556771549 is an equidigital number, since it uses as much as digits as its factorization.

556771549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323000, while the sum is 49.

The square root of 556771549 is about 23596.0070562797. The cubic root of 556771549 is about 822.6700339210.

The spelling of 556771549 in words is "five hundred fifty-six million, seven hundred seventy-one thousand, five hundred forty-nine".