549198779 has 2 divisors, whose sum is σ = 549198780. Its totient is φ = 549198778.

The previous prime is 549198751. The next prime is 549198809. The reversal of 549198779 is 977891945.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-549198779 is a prime.

It is not a weakly prime, because it can be changed into another prime (549198679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274599389 + 274599390.

It is an arithmetic number, because the mean of its divisors is an integer number (274599390).

Almost surely, 2^549198779 is an apocalyptic number.

549198779 is a deficient number, since it is larger than the sum of its proper divisors (1).

549198779 is an equidigital number, since it uses as much as digits as its factorization.

549198779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 59.

The square root of 549198779 is about 23434.9904843164. The cubic root of 549198779 is about 818.9232242769.

The spelling of 549198779 in words is "five hundred forty-nine million, one hundred ninety-eight thousand, seven hundred seventy-nine".