1220663 has 2 divisors, whose sum is σ = 1220664. Its totient is φ = 1220662.

The previous prime is 1220657. The next prime is 1220669. The reversal of 1220663 is 3660221.

It is a balanced prime because it is at equal distance from previous prime (1220657) and next prime (1220669).

It is an emirp because it is prime and its reverse (3660221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220663 - 2⁶ = 1220599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610331 + 610332.

It is an arithmetic number, because the mean of its divisors is an integer number (610332).

2^1220663 is an apocalyptic number.

1220663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220663 is an equidigital number, since it uses as much as digits as its factorization.

1220663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1220663 is about 1104.8361869526. The cubic root of 1220663 is about 106.8723256629.

Adding to 1220663 its reverse (3660221), we get a palindrome (4880884).

The spelling of 1220663 in words is "one million, two hundred twenty thousand, six hundred sixty-three".