1212816443 has 2 divisors, whose sum is σ = 1212816444. Its totient is φ = 1212816442.

The previous prime is 1212816433. The next prime is 1212816461. The reversal of 1212816443 is 3446182121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212816443 - 2¹⁰ = 1212815419 is a prime.

It is a super-2 number, since 2×1212816443² = 2941847448822344498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1212816413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606408221 + 606408222.

It is an arithmetic number, because the mean of its divisors is an integer number (606408222).

Almost surely, 2^1212816443 is an apocalyptic number.

1212816443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212816443 is an equidigital number, since it uses as much as digits as its factorization.

1212816443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 32.

The square root of 1212816443 is about 34825.5142532023. The cubic root of 1212816443 is about 1066.4283751663.

Adding to 1212816443 its reverse (3446182121), we get a palindrome (4658998564).

The spelling of 1212816443 in words is "one billion, two hundred twelve million, eight hundred sixteen thousand, four hundred forty-three".