1268278871 has 4 divisors (see below), whose sum is σ = 1299212544. Its totient is φ = 1237345200.

The previous prime is 1268278867. The next prime is 1268278909. The reversal of 1268278871 is 1788728621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1788728621 = 971 ⋅1842151.

It is a cyclic number.

It is not a de Polignac number, because 1268278871 - 2² = 1268278867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268278801) 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, 15466775 + ... + 15466856.

It is an arithmetic number, because the mean of its divisors is an integer number (324803136).

Almost surely, 2^1268278871 is an apocalyptic number.

1268278871 is a deficient number, since it is larger than the sum of its proper divisors (30933673).

1268278871 is an equidigital number, since it uses as much as digits as its factorization.

1268278871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30933672.

The product of its digits is 602112, while the sum is 50.

The square root of 1268278871 is about 35612.9031532112. The cubic root of 1268278871 is about 1082.4427080247.

The spelling of 1268278871 in words is "one billion, two hundred sixty-eight million, two hundred seventy-eight thousand, eight hundred seventy-one".