549451109 has 2 divisors, whose sum is σ = 549451110. Its totient is φ = 549451108.

The previous prime is 549451079. The next prime is 549451151. The reversal of 549451109 is 901154945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517562500 + 31888609 = 22750^2 + 5647^2 .

It is a cyclic number.

It is not a de Polignac number, because 549451109 - 2¹² = 549447013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549453109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274725554 + 274725555.

It is an arithmetic number, because the mean of its divisors is an integer number (274725555).

Almost surely, 2^549451109 is an apocalyptic number.

It is an amenable number.

549451109 is a deficient number, since it is larger than the sum of its proper divisors (1).

549451109 is an equidigital number, since it uses as much as digits as its factorization.

549451109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 549451109 is about 23440.3734825194. The cubic root of 549451109 is about 819.0486234744.

The spelling of 549451109 in words is "five hundred forty-nine million, four hundred fifty-one thousand, one hundred nine".