8131320 has 64 divisors (see below), whose sum is σ = 27108000. Its totient is φ = 2168064.

The previous prime is 8131309. The next prime is 8131327. The reversal of 8131320 is 231318.

It is a super-2 number, since 2×8131320² = 132236729884800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 8131293 and 8131302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8131327) 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, 2685 + ... + 4844.

Almost surely, 2^8131320 is an apocalyptic number.

It is an amenable number.

8131320 is an abundant number, since it is smaller than the sum of its proper divisors (18976680).

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

8131320 is a wasteful number, since it uses less digits than its factorization.

8131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7549 (or 7539 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 8131320 is about 2851.5469485877. The cubic root of 8131320 is about 201.0883995213.

Adding to 8131320 its reverse (231318), we get a palindrome (8362638).

It can be divided in two parts, 8 and 131320, that added together give a triangular number (131328 = T₅₁₂).

The spelling of 8131320 in words is "eight million, one hundred thirty-one thousand, three hundred twenty".