1211503144513 has 2 divisors, whose sum is σ = 1211503144514. Its totient is φ = 1211503144512.

The previous prime is 1211503144493. The next prime is 1211503144531. The reversal of 1211503144513 is 3154413051121.

It is a happy number.

Together with next prime (1211503144531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 785690777664 + 425812366849 = 886392^2 + 652543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211503144513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211503144213) 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, 605751572256 + 605751572257.

It is an arithmetic number, because the mean of its divisors is an integer number (605751572257).

Almost surely, 2^{1211503144513} is an apocalyptic number.

It is an amenable number.

1211503144513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211503144513 is an equidigital number, since it uses as much as digits as its factorization.

1211503144513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 1211503144513 its reverse (3154413051121), we get a palindrome (4365916195634).

The spelling of 1211503144513 in words is "one trillion, two hundred eleven billion, five hundred three million, one hundred forty-four thousand, five hundred thirteen".