1313081520 has 80 divisors (see below), whose sum is σ = 4075533792. Its totient is φ = 349726720.

The previous prime is 1313081501. The next prime is 1313081527. The reversal of 1313081520 is 251803131.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1313081527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225850 + ... + 231590.

Almost surely, 2^1313081520 is an apocalyptic number.

1313081520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1313081520 is an abundant number, since it is smaller than the sum of its proper divisors (2762452272).

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

1313081520 is a wasteful number, since it uses less digits than its factorization.

1313081520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710 (or 6704 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1313081520 is about 36236.4667151752. The cubic root of 1313081520 is about 1095.0414612853.

Adding to 1313081520 its reverse (251803131), we get a palindrome (1564884651).

The spelling of 1313081520 in words is "one billion, three hundred thirteen million, eighty-one thousand, five hundred twenty".