1242503513281 has 2 divisors, whose sum is σ = 1242503513282. Its totient is φ = 1242503513280.

The previous prime is 1242503513131. The next prime is 1242503513297. The reversal of 1242503513281 is 1823153052421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1241628832656 + 874680625 = 1114284^2 + 29575^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242503513281 - 2⁹ = 1242503512769 is a prime.

It is a super-2 number, since 2×1242503513281² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1242503513281.

It is not a weakly prime, because it can be changed into another prime (1242503813281) 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, 621251756640 + 621251756641.

It is an arithmetic number, because the mean of its divisors is an integer number (621251756641).

Almost surely, 2^{1242503513281} is an apocalyptic number.

It is an amenable number.

1242503513281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242503513281 is an equidigital number, since it uses as much as digits as its factorization.

1242503513281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 1242503513281 in words is "one trillion, two hundred forty-two billion, five hundred three million, five hundred thirteen thousand, two hundred eighty-one".