55018289 has 2 divisors, whose sum is σ = 55018290. Its totient is φ = 55018288.

The previous prime is 55018261. The next prime is 55018291. The reversal of 55018289 is 98281055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55011889 + 6400 = 7417^2 + 80^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55018289 is a prime.

Together with 55018291, 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 (55018219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27509144 + 27509145.

It is an arithmetic number, because the mean of its divisors is an integer number (27509145).

Almost surely, 2^55018289 is an apocalyptic number.

It is an amenable number.

55018289 is a deficient number, since it is larger than the sum of its proper divisors (1).

55018289 is an equidigital number, since it uses as much as digits as its factorization.

55018289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 55018289 is about 7417.4314287360. The cubic root of 55018289 is about 380.3373942517.

The spelling of 55018289 in words is "fifty-five million, eighteen thousand, two hundred eighty-nine".