1311540500 has 96 divisors (see below), whose sum is σ = 3041176320. Its totient is φ = 493046400.

The previous prime is 1311540469. The next prime is 1311540551. The reversal of 1311540500 is 50451131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 677534 + ... + 679466.

It is an arithmetic number, because the mean of its divisors is an integer number (31678920).

Almost surely, 2^1311540500 is an apocalyptic number.

1311540500 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 1311540500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1520588160).

1311540500 is an abundant number, since it is smaller than the sum of its proper divisors (1729635820).

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

1311540500 is a wasteful number, since it uses less digits than its factorization.

1311540500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034 (or 2022 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1311540500 is about 36215.1970863062. The cubic root of 1311540500 is about 1094.6129168437.

Adding to 1311540500 its reverse (50451131), we get a palindrome (1361991631).

The spelling of 1311540500 in words is "one billion, three hundred eleven million, five hundred forty thousand, five hundred".