1213189 has 2 divisors, whose sum is σ = 1213190. Its totient is φ = 1213188.

The previous prime is 1213183. The next prime is 1213213. The reversal of 1213189 is 9813121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 801025 + 412164 = 895^2 + 642^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213189 - 2⁹ = 1212677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606594 + 606595.

It is an arithmetic number, because the mean of its divisors is an integer number (606595).

2^1213189 is an apocalyptic number.

It is an amenable number.

1213189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213189 is an equidigital number, since it uses as much as digits as its factorization.

1213189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 25.

The square root of 1213189 is about 1101.4485916283. The cubic root of 1213189 is about 106.6537560329.

The spelling of 1213189 in words is "one million, two hundred thirteen thousand, one hundred eighty-nine".