1212012289 has 2 divisors, whose sum is σ = 1212012290. Its totient is φ = 1212012288.

The previous prime is 1212012287. The next prime is 1212012313. The reversal of 1212012289 is 9822102121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1165881025 + 46131264 = 34145^2 + 6792^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212012289 - 2¹ = 1212012287 is a prime.

Together with 1212012287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1212012287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606006144 + 606006145.

It is an arithmetic number, because the mean of its divisors is an integer number (606006145).

Almost surely, 2^1212012289 is an apocalyptic number.

It is an amenable number.

1212012289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212012289 is an equidigital number, since it uses as much as digits as its factorization.

1212012289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1212012289 is about 34813.9668667620. The cubic root of 1212012289 is about 1066.1926257652.

The spelling of 1212012289 in words is "one billion, two hundred twelve million, twelve thousand, two hundred eighty-nine".