1311026808 has 128 divisors (see below), whose sum is σ = 4271339520. Its totient is φ = 325416960.

The previous prime is 1311026803. The next prime is 1311026813. The reversal of 1311026808 is 8086201131.

It is an interprime number because it is at equal distance from previous prime (1311026803) and next prime (1311026813).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311026803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19473 + ... + 54783.

It is an arithmetic number, because the mean of its divisors is an integer number (33369840).

Almost surely, 2^1311026808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311026808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2135669760).

1311026808 is an abundant number, since it is smaller than the sum of its proper divisors (2960312712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311026808 is a wasteful number, since it uses less digits than its factorization.

1311026808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35357 (or 35353 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1311026808 is about 36208.1041757229. The cubic root of 1311026808 is about 1094.4699889087.

Adding to 1311026808 its reverse (8086201131), we get a palindrome (9397227939).

The spelling of 1311026808 in words is "one billion, three hundred eleven million, twenty-six thousand, eight hundred eight".