1216489 has 2 divisors, whose sum is σ = 1216490. Its totient is φ = 1216488.

The previous prime is 1216459. The next prime is 1216507. The reversal of 1216489 is 9846121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1192464 + 24025 = 1092^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216489 - 2¹¹ = 1214441 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216489.

It is not a weakly prime, because it can be changed into another prime (1216459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608244 + 608245.

It is an arithmetic number, because the mean of its divisors is an integer number (608245).

2^1216489 is an apocalyptic number.

It is an amenable number.

1216489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216489 is an equidigital number, since it uses as much as digits as its factorization.

1216489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 1216489 is about 1102.9456015598. The cubic root of 1216489 is about 106.7503715797.

The spelling of 1216489 in words is "one million, two hundred sixteen thousand, four hundred eighty-nine".