549099409 has 2 divisors, whose sum is σ = 549099410. Its totient is φ = 549099408.

The previous prime is 549099391. The next prime is 549099413. The reversal of 549099409 is 904990945.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433472400 + 115627009 = 20820^2 + 10753^2 .

It is a cyclic number.

It is not a de Polignac number, because 549099409 - 2⁷ = 549099281 is a prime.

It is not a weakly prime, because it can be changed into another prime (549099709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274549704 + 274549705.

It is an arithmetic number, because the mean of its divisors is an integer number (274549705).

Almost surely, 2^549099409 is an apocalyptic number.

It is an amenable number.

549099409 is a deficient number, since it is larger than the sum of its proper divisors (1).

549099409 is an equidigital number, since it uses as much as digits as its factorization.

549099409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 549099409 is about 23432.8702680658. The cubic root of 549099409 is about 818.8738303159.

The spelling of 549099409 in words is "five hundred forty-nine million, ninety-nine thousand, four hundred nine".