1212123389 has 2 divisors, whose sum is σ = 1212123390. Its totient is φ = 1212123388.

The previous prime is 1212123383. The next prime is 1212123439. The reversal of 1212123389 is 9833212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1200276025 + 11847364 = 34645^2 + 3442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212123389 is a prime.

It is a super-2 number, since 2×1212123389² = 2938486220321690642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212123383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606061694 + 606061695.

It is an arithmetic number, because the mean of its divisors is an integer number (606061695).

Almost surely, 2^1212123389 is an apocalyptic number.

It is an amenable number.

1212123389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212123389 is an equidigital number, since it uses as much as digits as its factorization.

1212123389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 1212123389 is about 34815.5624541670. The cubic root of 1212123389 is about 1066.2252025475.

The spelling of 1212123389 in words is "one billion, two hundred twelve million, one hundred twenty-three thousand, three hundred eighty-nine".