55244213 has 2 divisors, whose sum is σ = 55244214. Its totient is φ = 55244212.

The previous prime is 55244209. The next prime is 55244221. The reversal of 55244213 is 31244255.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55011889 + 232324 = 7417^2 + 482^2 .

It is a cyclic number.

It is not a de Polignac number, because 55244213 - 2² = 55244209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55241213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27622106 + 27622107.

It is an arithmetic number, because the mean of its divisors is an integer number (27622107).

Almost surely, 2^55244213 is an apocalyptic number.

It is an amenable number.

55244213 is a deficient number, since it is larger than the sum of its proper divisors (1).

55244213 is an equidigital number, since it uses as much as digits as its factorization.

55244213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 26.

The square root of 55244213 is about 7432.6450877194. The cubic root of 55244213 is about 380.8572819646.

Adding to 55244213 its reverse (31244255), we get a palindrome (86488468).

The spelling of 55244213 in words is "fifty-five million, two hundred forty-four thousand, two hundred thirteen".