1217663 has 2 divisors, whose sum is σ = 1217664. Its totient is φ = 1217662.

The previous prime is 1217651. The next prime is 1217669. The reversal of 1217663 is 3667121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1217663 - 2⁴ = 1217647 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608831 + 608832.

It is an arithmetic number, because the mean of its divisors is an integer number (608832).

2^1217663 is an apocalyptic number.

1217663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217663 is an equidigital number, since it uses as much as digits as its factorization.

1217663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

The square root of 1217663 is about 1103.4776844141. The cubic root of 1217663 is about 106.7847011522.

The spelling of 1217663 in words is "one million, two hundred seventeen thousand, six hundred sixty-three".