1219649 has 2 divisors, whose sum is σ = 1219650. Its totient is φ = 1219648.

The previous prime is 1219643. The next prime is 1219651. The reversal of 1219649 is 9469121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1117249 + 102400 = 1057^2 + 320^2 .

It is an emirp because it is prime and its reverse (9469121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1219649 - 2¹² = 1215553 is a prime.

Together with 1219651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1219643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609824 + 609825.

It is an arithmetic number, because the mean of its divisors is an integer number (609825).

2^1219649 is an apocalyptic number.

It is an amenable number.

1219649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219649 is an equidigital number, since it uses as much as digits as its factorization.

1219649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 1219649 is about 1104.3772000544. The cubic root of 1219649 is about 106.8427246567.

The spelling of 1219649 in words is "one million, two hundred nineteen thousand, six hundred forty-nine".