1312131120 has 80 divisors (see below), whose sum is σ = 4124950272. Its totient is φ = 344968960.

The previous prime is 1312131113. The next prime is 1312131131. The reversal of 1312131120 is 211312131.

It is a happy number.

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 (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1312131120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21462 + ... + 55541.

Almost surely, 2^1312131120 is an apocalyptic number.

1312131120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312131120 is an abundant number, since it is smaller than the sum of its proper divisors (2812819152).

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

1312131120 is a wasteful number, since it uses less digits than its factorization.

1312131120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77090 (or 77084 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1312131120 is about 36223.3504800426. The cubic root of 1312131120 is about 1094.7772028519. Note that the first 3 decimals are identical.

Adding to 1312131120 its reverse (211312131), we get a palindrome (1523443251).

The spelling of 1312131120 in words is "one billion, three hundred twelve million, one hundred thirty-one thousand, one hundred twenty".