1311986560 has 64 divisors (see below), whose sum is σ = 3320993520. Its totient is φ = 493920256.

The previous prime is 1311986551. The next prime is 1311986567. The reversal of 1311986560 is 656891131.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311986567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49414 + ... + 71173.

Almost surely, 2^1311986560 is an apocalyptic number.

1311986560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311986560 is an abundant number, since it is smaller than the sum of its proper divisors (2009006960).

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

1311986560 is a wasteful number, since it uses less digits than its factorization.

1311986560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120623 (or 120611 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1311986560 is about 36221.3550271107. The cubic root of 1311986560 is about 1094.7369968078.

The spelling of 1311986560 in words is "one billion, three hundred eleven million, nine hundred eighty-six thousand, five hundred sixty".