1216559 has 2 divisors, whose sum is σ = 1216560. Its totient is φ = 1216558.

The previous prime is 1216547. The next prime is 1216561. The reversal of 1216559 is 9556121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216559 - 2⁴ = 1216543 is a prime.

Together with 1216561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608279 + 608280.

It is an arithmetic number, because the mean of its divisors is an integer number (608280).

2^1216559 is an apocalyptic number.

1216559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216559 is an equidigital number, since it uses as much as digits as its factorization.

1216559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 29.

The square root of 1216559 is about 1102.9773343093. The cubic root of 1216559 is about 106.7524191069.

The spelling of 1216559 in words is "one million, two hundred sixteen thousand, five hundred fifty-nine".