54881209 has 2 divisors, whose sum is σ = 54881210. Its totient is φ = 54881208.

The previous prime is 54881207. The next prime is 54881251. The reversal of 54881209 is 90218845.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46308025 + 8573184 = 6805^2 + 2928^2 .

It is a cyclic number.

It is not a de Polignac number, because 54881209 - 2¹ = 54881207 is a prime.

Together with 54881207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (54881207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27440604 + 27440605.

It is an arithmetic number, because the mean of its divisors is an integer number (27440605).

Almost surely, 2^54881209 is an apocalyptic number.

It is an amenable number.

54881209 is a deficient number, since it is larger than the sum of its proper divisors (1).

54881209 is an equidigital number, since it uses as much as digits as its factorization.

54881209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 54881209 is about 7408.1852703614. The cubic root of 54881209 is about 380.0212568903.

The spelling of 54881209 in words is "fifty-four million, eight hundred eighty-one thousand, two hundred nine".