54665209 has 2 divisors, whose sum is σ = 54665210. Its totient is φ = 54665208.

The previous prime is 54665197. The next prime is 54665213. The reversal of 54665209 is 90256645.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39337984 + 15327225 = 6272^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 54665209 - 2¹⁹ = 54140921 is a prime.

It is not a weakly prime, because it can be changed into another prime (54665239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27332604 + 27332605.

It is an arithmetic number, because the mean of its divisors is an integer number (27332605).

Almost surely, 2^54665209 is an apocalyptic number.

It is an amenable number.

54665209 is a deficient number, since it is larger than the sum of its proper divisors (1).

54665209 is an equidigital number, since it uses as much as digits as its factorization.

54665209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 54665209 is about 7393.5924285830. The cubic root of 54665209 is about 379.5220422055.

The spelling of 54665209 in words is "fifty-four million, six hundred sixty-five thousand, two hundred nine".