12520313 has 16 divisors (see below), whose sum is σ = 14401296. Its totient is φ = 10782720.

The previous prime is 12520309. The next prime is 12520337. The reversal of 12520313 is 31302521.

It can be written as a sum of positive squares in 8 ways, for example, as 5697769 + 6822544 = 2387^2 + 2612^2 .

It is not a de Polignac number, because 12520313 - 2² = 12520309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 12520291 and 12520300.

It is not an unprimeable number, because it can be changed into a prime (12550313) 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, 39845 + ... + 40157.

It is an arithmetic number, because the mean of its divisors is an integer number (900081).

Almost surely, 2^12520313 is an apocalyptic number.

12520313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12520313 is a deficient number, since it is larger than the sum of its proper divisors (1880983).

12520313 is a wasteful number, since it uses less digits than its factorization.

12520313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 12520313 is about 3538.4054318294. The cubic root of 12520313 is about 232.2050864379.

Adding to 12520313 its reverse (31302521), we get a palindrome (43822834).

The spelling of 12520313 in words is "twelve million, five hundred twenty thousand, three hundred thirteen".