12531520 has 28 divisors (see below), whose sum is σ = 29841444. Its totient is φ = 5012480.

The previous prime is 12531517. The next prime is 12531521. The reversal of 12531520 is 2513521.

It can be written as a sum of positive squares in 2 ways, for example, as 5089536 + 7441984 = 2256^2 + 2728^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531521) 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 3 ways as a sum of consecutive naturals, for example, 19261 + ... + 19900.

Almost surely, 2^12531520 is an apocalyptic number.

12531520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12531520 is an abundant number, since it is smaller than the sum of its proper divisors (17309924).

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

12531520 is an equidigital number, since it uses as much as digits as its factorization.

12531520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39178 (or 39168 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 12531520 is about 3539.9887005469. The cubic root of 12531520 is about 232.2743484534.

The spelling of 12531520 in words is "twelve million, five hundred thirty-one thousand, five hundred twenty".