55541209 has 2 divisors, whose sum is σ = 55541210. Its totient is φ = 55541208.

The previous prime is 55541207. The next prime is 55541219. The reversal of 55541209 is 90214555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55175184 + 366025 = 7428^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 55541209 - 2¹ = 55541207 is a prime.

Together with 55541207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55541201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27770604 + 27770605.

It is an arithmetic number, because the mean of its divisors is an integer number (27770605).

Almost surely, 2^55541209 is an apocalyptic number.

It is an amenable number.

55541209 is a deficient number, since it is larger than the sum of its proper divisors (1).

55541209 is an equidigital number, since it uses as much as digits as its factorization.

55541209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 55541209 is about 7452.5974666555. The cubic root of 55541209 is about 381.5385659438.

The spelling of 55541209 in words is "fifty-five million, five hundred forty-one thousand, two hundred nine".