1221383 has 2 divisors, whose sum is σ = 1221384. Its totient is φ = 1221382.

The previous prime is 1221379. The next prime is 1221391. The reversal of 1221383 is 3831221.

It is a weak prime.

It is an emirp because it is prime and its reverse (3831221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221383 - 2² = 1221379 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610691 + 610692.

It is an arithmetic number, because the mean of its divisors is an integer number (610692).

2^1221383 is an apocalyptic number.

1221383 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221383 is an equidigital number, since it uses as much as digits as its factorization.

1221383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 1221383 is about 1105.1619790782. The cubic root of 1221383 is about 106.8933341778.

The spelling of 1221383 in words is "one million, two hundred twenty-one thousand, three hundred eighty-three".