1243854135103 has 2 divisors, whose sum is σ = 1243854135104. Its totient is φ = 1243854135102.

The previous prime is 1243854135101. The next prime is 1243854135113. The reversal of 1243854135103 is 3015314583421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243854135103 - 2¹ = 1243854135101 is a prime.

Together with 1243854135101, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243854135101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621927067551 + 621927067552.

It is an arithmetic number, because the mean of its divisors is an integer number (621927067552).

Almost surely, 2^{1243854135103} is an apocalyptic number.

1243854135103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243854135103 is an equidigital number, since it uses as much as digits as its factorization.

1243854135103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 1243854135103 in words is "one trillion, two hundred forty-three billion, eight hundred fifty-four million, one hundred thirty-five thousand, one hundred three".