549128647 has 2 divisors, whose sum is σ = 549128648. Its totient is φ = 549128646.

The previous prime is 549128627. The next prime is 549128653. The reversal of 549128647 is 746821945.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-549128647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 549128597 and 549128606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549128627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274564323 + 274564324.

It is an arithmetic number, because the mean of its divisors is an integer number (274564324).

Almost surely, 2^549128647 is an apocalyptic number.

549128647 is a deficient number, since it is larger than the sum of its proper divisors (1).

549128647 is an equidigital number, since it uses as much as digits as its factorization.

549128647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The square root of 549128647 is about 23433.4941269969. The cubic root of 549128647 is about 818.8883643011. Note that the first 3 decimals are identical.

The spelling of 549128647 in words is "five hundred forty-nine million, one hundred twenty-eight thousand, six hundred forty-seven".