55000243 has 2 divisors, whose sum is σ = 55000244. Its totient is φ = 55000242.

The previous prime is 55000207. The next prime is 55000259. The reversal of 55000243 is 34200055.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55000243 - 2²¹ = 52903091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55000243.

It is not a weakly prime, because it can be changed into another prime (55000643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27500121 + 27500122.

It is an arithmetic number, because the mean of its divisors is an integer number (27500122).

Almost surely, 2^55000243 is an apocalyptic number.

55000243 is a deficient number, since it is larger than the sum of its proper divisors (1).

55000243 is an equidigital number, since it uses as much as digits as its factorization.

55000243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 55000243 is about 7416.2148701342. The cubic root of 55000243 is about 380.2958061465.

Adding to 55000243 its reverse (34200055), we get a palindrome (89200298).

The spelling of 55000243 in words is "fifty-five million, two hundred forty-three", and thus it is an aban number.