1212445404491 has 2 divisors, whose sum is σ = 1212445404492. Its totient is φ = 1212445404490.

The previous prime is 1212445404481. The next prime is 1212445404557. The reversal of 1212445404491 is 1944045442121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212445404491 - 2¹⁴ = 1212445388107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1212445404421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606222702245 + 606222702246.

It is an arithmetic number, because the mean of its divisors is an integer number (606222702246).

Almost surely, 2^{1212445404491} is an apocalyptic number.

1212445404491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212445404491 is an equidigital number, since it uses as much as digits as its factorization.

1212445404491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 1212445404491 in words is "one trillion, two hundred twelve billion, four hundred forty-five million, four hundred four thousand, four hundred ninety-one".