55123217 has 2 divisors, whose sum is σ = 55123218. Its totient is φ = 55123216.

The previous prime is 55123181. The next prime is 55123219. The reversal of 55123217 is 71232155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52287361 + 2835856 = 7231^2 + 1684^2 .

It is a cyclic number.

It is not a de Polignac number, because 55123217 - 2¹⁴ = 55106833 is a prime.

Together with 55123219, 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 (55123219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27561608 + 27561609.

It is an arithmetic number, because the mean of its divisors is an integer number (27561609).

Almost surely, 2^55123217 is an apocalyptic number.

It is an amenable number.

55123217 is a deficient number, since it is larger than the sum of its proper divisors (1).

55123217 is an equidigital number, since it uses as much as digits as its factorization.

55123217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 26.

The square root of 55123217 is about 7424.5011280220. The cubic root of 55123217 is about 380.5790272280.

The spelling of 55123217 in words is "fifty-five million, one hundred twenty-three thousand, two hundred seventeen".