12531550 has 48 divisors (see below), whose sum is σ = 25792992. Its totient is φ = 4505600.

The previous prime is 12531539. The next prime is 12531553. The reversal of 12531550 is 5513521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19230 + ... + 19870.

It is an arithmetic number, because the mean of its divisors is an integer number (537354).

Almost surely, 2^12531550 is an apocalyptic number.

12531550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12531550 is an abundant number, since it is smaller than the sum of its proper divisors (13261442).

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

12531550 is a wasteful number, since it uses less digits than its factorization.

12531550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 12531550 is about 3539.9929378461. The cubic root of 12531550 is about 232.2745338053.

The spelling of 12531550 in words is "twelve million, five hundred thirty-one thousand, five hundred fifty".