1850220217 has 2 divisors, whose sum is σ = 1850220218. Its totient is φ = 1850220216.

The previous prime is 1850220179. The next prime is 1850220233. The reversal of 1850220217 is 7120220581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1154368576 + 695851641 = 33976^2 + 26379^2 .

It is a cyclic number.

It is not a de Polignac number, because 1850220217 - 2¹⁹ = 1849695929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1850220277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925110108 + 925110109.

It is an arithmetic number, because the mean of its divisors is an integer number (925110109).

Almost surely, 2^1850220217 is an apocalyptic number.

It is an amenable number.

1850220217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1850220217 is an equidigital number, since it uses as much as digits as its factorization.

1850220217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 1850220217 is about 43014.1862296615. The cubic root of 1850220217 is about 1227.6497339199.

Adding to 1850220217 its reverse (7120220581), we get a palindrome (8970440798).

The spelling of 1850220217 in words is "one billion, eight hundred fifty million, two hundred twenty thousand, two hundred seventeen".