546721009 has 2 divisors, whose sum is σ = 546721010. Its totient is φ = 546721008.

The previous prime is 546720997. The next prime is 546721027. The reversal of 546721009 is 900127645.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 533471409 + 13249600 = 23097^2 + 3640^2 .

It is a cyclic number.

It is not a de Polignac number, because 546721009 - 2²³ = 538332401 is a prime.

It is not a weakly prime, because it can be changed into another prime (546721039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273360504 + 273360505.

It is an arithmetic number, because the mean of its divisors is an integer number (273360505).

Almost surely, 2^546721009 is an apocalyptic number.

It is an amenable number.

546721009 is a deficient number, since it is larger than the sum of its proper divisors (1).

546721009 is an equidigital number, since it uses as much as digits as its factorization.

546721009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 546721009 is about 23382.0659694562. The cubic root of 546721009 is about 817.6898138048.

The spelling of 546721009 in words is "five hundred forty-six million, seven hundred twenty-one thousand, nine".