1311814520 has 64 divisors (see below), whose sum is σ = 3132367200. Its totient is φ = 492728320.

The previous prime is 1311814477. The next prime is 1311814547. The reversal of 1311814520 is 254181131.

It is a self number, because there is not a number n which added to its sum of digits gives 1311814520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331916 + ... + 335844.

Almost surely, 2^1311814520 is an apocalyptic number.

1311814520 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 1311814520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566183600).

1311814520 is an abundant number, since it is smaller than the sum of its proper divisors (1820552680).

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

1311814520 is a wasteful number, since it uses less digits than its factorization.

1311814520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448 (or 4444 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 1311814520 is about 36218.9801071206. The cubic root of 1311814520 is about 1094.6891439838.

Adding to 1311814520 its reverse (254181131), we get a palindrome (1565995651).

The spelling of 1311814520 in words is "one billion, three hundred eleven million, eight hundred fourteen thousand, five hundred twenty".