1243255124429 has 2 divisors, whose sum is σ = 1243255124430. Its totient is φ = 1243255124428.

The previous prime is 1243255124369. The next prime is 1243255124521. The reversal of 1243255124429 is 9244215523421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 781990027204 + 461265097225 = 884302^2 + 679165^2 .

It is an emirp because it is prime and its reverse (9244215523421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243255124429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243255124429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243255124929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621627562214 + 621627562215.

It is an arithmetic number, because the mean of its divisors is an integer number (621627562215).

Almost surely, 2^{1243255124429} is an apocalyptic number.

It is an amenable number.

1243255124429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243255124429 is an equidigital number, since it uses as much as digits as its factorization.

1243255124429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 44.

The spelling of 1243255124429 in words is "one trillion, two hundred forty-three billion, two hundred fifty-five million, one hundred twenty-four thousand, four hundred twenty-nine".