55222201 has 2 divisors, whose sum is σ = 55222202. Its totient is φ = 55222200.

The previous prime is 55222199. The next prime is 55222207. The reversal of 55222201 is 10222255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36723600 + 18498601 = 6060^2 + 4301^2 .

It is a cyclic number.

It is not a de Polignac number, because 55222201 - 2¹ = 55222199 is a prime.

Together with 55222199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55222207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27611100 + 27611101.

It is an arithmetic number, because the mean of its divisors is an integer number (27611101).

Almost surely, 2^55222201 is an apocalyptic number.

It is an amenable number.

55222201 is a deficient number, since it is larger than the sum of its proper divisors (1).

55222201 is an equidigital number, since it uses as much as digits as its factorization.

55222201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 55222201 is about 7431.1641752824. The cubic root of 55222201 is about 380.8066911803.

Adding to 55222201 its reverse (10222255), we get a palindrome (65444456).

The spelling of 55222201 in words is "fifty-five million, two hundred twenty-two thousand, two hundred one".