54278209 has 2 divisors, whose sum is σ = 54278210. Its totient is φ = 54278208.

The previous prime is 54278177. The next prime is 54278221. The reversal of 54278209 is 90287245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54066609 + 211600 = 7353^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 54278209 - 2⁵ = 54278177 is a prime.

It is a super-2 number, since 2×54278209² = 5892247944495362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (54278239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27139104 + 27139105.

It is an arithmetic number, because the mean of its divisors is an integer number (27139105).

Almost surely, 2^54278209 is an apocalyptic number.

It is an amenable number.

54278209 is a deficient number, since it is larger than the sum of its proper divisors (1).

54278209 is an equidigital number, since it uses as much as digits as its factorization.

54278209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 54278209 is about 7367.3746341556. The cubic root of 54278209 is about 378.6243170578.

The spelling of 54278209 in words is "fifty-four million, two hundred seventy-eight thousand, two hundred nine".