1268581243 has 4 divisors (see below), whose sum is σ = 1290082680. Its totient is φ = 1247079808.

The previous prime is 1268581219. The next prime is 1268581271. The reversal of 1268581243 is 3421858621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3421858621 = 97 ⋅35276893.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268581243 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1268581196 and 1268581205.

It is not an unprimeable number, because it can be changed into a prime (1268581543) 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 in 3 ways as a sum of consecutive naturals, for example, 10750630 + ... + 10750747.

It is an arithmetic number, because the mean of its divisors is an integer number (322520670).

Almost surely, 2^1268581243 is an apocalyptic number.

1268581243 is a deficient number, since it is larger than the sum of its proper divisors (21501437).

1268581243 is an equidigital number, since it uses as much as digits as its factorization.

1268581243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21501436.

The product of its digits is 92160, while the sum is 40.

The square root of 1268581243 is about 35617.1481592786. The cubic root of 1268581243 is about 1082.5287233763.

The spelling of 1268581243 in words is "one billion, two hundred sixty-eight million, five hundred eighty-one thousand, two hundred forty-three".