1311432500 has 120 divisors (see below), whose sum is σ = 3307491264. Its totient is φ = 445536000.

The previous prime is 1311432481. The next prime is 1311432503. The reversal of 1311432500 is 52341131.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311432503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2397227 + ... + 2397773.

Almost surely, 2^1311432500 is an apocalyptic number.

1311432500 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 1311432500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1653745632).

1311432500 is an abundant number, since it is smaller than the sum of its proper divisors (1996058764).

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

1311432500 is a wasteful number, since it uses less digits than its factorization.

1311432500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1311432500 is about 36213.7059688732. The cubic root of 1311432500 is about 1094.5828703855.

Adding to 1311432500 its reverse (52341131), we get a palindrome (1363773631).

The spelling of 1311432500 in words is "one billion, three hundred eleven million, four hundred thirty-two thousand, five hundred".