13131520 has 36 divisors (see below), whose sum is σ = 31457160. Its totient is φ = 5252096.

The previous prime is 13131511. The next prime is 13131523. The reversal of 13131520 is 2513131.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 13131494 and 13131503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3850 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (873810).

Almost surely, 2^13131520 is an apocalyptic number.

13131520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13131520 is an abundant number, since it is smaller than the sum of its proper divisors (18325640).

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

13131520 is an equidigital number, since it uses as much as digits as its factorization.

13131520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10280 (or 10266 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 13131520 is about 3623.7439203123. The cubic root of 13131520 is about 235.9237520606.

Adding to 13131520 its reverse (2513131), we get a palindrome (15644651).

The spelling of 13131520 in words is "thirteen million, one hundred thirty-one thousand, five hundred twenty".