1311523500 has 96 divisors (see below), whose sum is σ = 4364785152. Its totient is φ = 299774400.

The previous prime is 1311523489. The next prime is 1311523501. The reversal of 1311523500 is 53251131.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1311523501) 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 31 ways as a sum of consecutive naturals, for example, 51954 + ... + 72953.

It is an arithmetic number, because the mean of its divisors is an integer number (45466512).

Almost surely, 2^1311523500 is an apocalyptic number.

1311523500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311523500 is an abundant number, since it is smaller than the sum of its proper divisors (3053261652).

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

1311523500 is a wasteful number, since it uses less digits than its factorization.

1311523500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124936 (or 124924 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1311523500 is about 36214.9623774484. The cubic root of 1311523500 is about 1094.6081874180.

Adding to 1311523500 its reverse (53251131), we get a palindrome (1364774631).

The spelling of 1311523500 in words is "one billion, three hundred eleven million, five hundred twenty-three thousand, five hundred".