1281103725683 has 4 divisors (see below), whose sum is σ = 1281110670048. Its totient is φ = 1281096781320.

The previous prime is 1281103725673. The next prime is 1281103725721. The reversal of 1281103725683 is 3865273011821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1281103725683 - 2¹⁶ = 1281103660147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281103725673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3187691 + ... + 3567012.

It is an arithmetic number, because the mean of its divisors is an integer number (320277667512).

Almost surely, 2^{1281103725683} is an apocalyptic number.

1281103725683 is a deficient number, since it is larger than the sum of its proper divisors (6944365).

1281103725683 is an equidigital number, since it uses as much as digits as its factorization.

1281103725683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944364.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 1281103725683 in words is "one trillion, two hundred eighty-one billion, one hundred three million, seven hundred twenty-five thousand, six hundred eighty-three".