1220636017 has 2 divisors, whose sum is σ = 1220636018. Its totient is φ = 1220636016.

The previous prime is 1220636003. The next prime is 1220636077. The reversal of 1220636017 is 7106360221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983198736 + 237437281 = 31356^2 + 15409^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220636017 - 2¹⁹ = 1220111729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220636077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610318008 + 610318009.

It is an arithmetic number, because the mean of its divisors is an integer number (610318009).

Almost surely, 2^1220636017 is an apocalyptic number.

It is an amenable number.

1220636017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220636017 is an equidigital number, since it uses as much as digits as its factorization.

1220636017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1220636017 is about 34937.6017637158. The cubic root of 1220636017 is about 1068.7153817908.

Adding to 1220636017 its reverse (7106360221), we get a palindrome (8326996238).

The spelling of 1220636017 in words is "one billion, two hundred twenty million, six hundred thirty-six thousand, seventeen".