1212444643 has 2 divisors, whose sum is σ = 1212444644. Its totient is φ = 1212444642.

The previous prime is 1212444553. The next prime is 1212444671. The reversal of 1212444643 is 3464442121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212444643 - 2¹³ = 1212436451 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212444683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606222321 + 606222322.

It is an arithmetic number, because the mean of its divisors is an integer number (606222322).

Almost surely, 2^1212444643 is an apocalyptic number.

1212444643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212444643 is an equidigital number, since it uses as much as digits as its factorization.

1212444643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 31.

The square root of 1212444643 is about 34820.1758036917. The cubic root of 1212444643 is about 1066.3193895635.

Adding to 1212444643 its reverse (3464442121), we get a palindrome (4676886764).

The spelling of 1212444643 in words is "one billion, two hundred twelve million, four hundred forty-four thousand, six hundred forty-three".