54819209 has 2 divisors, whose sum is σ = 54819210. Its totient is φ = 54819208.

The previous prime is 54819187. The next prime is 54819211. The reversal of 54819209 is 90291845.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31393609 + 23425600 = 5603^2 + 4840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54819209 is a prime.

Together with 54819211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (54819299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27409604 + 27409605.

It is an arithmetic number, because the mean of its divisors is an integer number (27409605).

Almost surely, 2^54819209 is an apocalyptic number.

It is an amenable number.

54819209 is a deficient number, since it is larger than the sum of its proper divisors (1).

54819209 is an equidigital number, since it uses as much as digits as its factorization.

54819209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 54819209 is about 7403.9995272825. Note that the first 3 decimals coincide. The cubic root of 54819209 is about 379.8780980178.

The spelling of 54819209 in words is "fifty-four million, eight hundred nineteen thousand, two hundred nine".