1311065280 has 168 divisors, whose sum is σ = 5153814432. Its totient is φ = 299667456.

The previous prime is 1311065191. The next prime is 1311065281. The reversal of 1311065280 is 825601131.

1311065280 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 0 + 652 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is not an unprimeable number, because it can be changed into a prime (1311065281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12357 + ... + 52676.

Almost surely, 2^1311065280 is an apocalyptic number.

1311065280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311065280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2576907216).

1311065280 is an abundant number, since it is smaller than the sum of its proper divisors (3842749152).

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

1311065280 is a wasteful number, since it uses less digits than its factorization.

1311065280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65063 (or 65050 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1311065280 is about 36208.6354341060. The cubic root of 1311065280 is about 1094.4806945219.

The spelling of 1311065280 in words is "one billion, three hundred eleven million, sixty-five thousand, two hundred eighty".