1212013189 has 2 divisors, whose sum is σ = 1212013190. Its totient is φ = 1212013188.

The previous prime is 1212013163. The next prime is 1212013217. The reversal of 1212013189 is 9813102121.

It is an a-pointer prime, because the next prime (1212013217) can be obtained adding 1212013189 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079648164 + 132365025 = 32858^2 + 11505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212013189 - 2⁹ = 1212012677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212013139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606006594 + 606006595.

It is an arithmetic number, because the mean of its divisors is an integer number (606006595).

Almost surely, 2^1212013189 is an apocalyptic number.

It is an amenable number.

1212013189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212013189 is an equidigital number, since it uses as much as digits as its factorization.

1212013189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 1212013189 is about 34813.9797926063. The cubic root of 1212013189 is about 1066.1928896715.

The spelling of 1212013189 in words is "one billion, two hundred twelve million, thirteen thousand, one hundred eighty-nine".