12531905 has 16 divisors (see below), whose sum is σ = 15634944. Its totient is φ = 9632640.

The previous prime is 12531889. The next prime is 12531913. The reversal of 12531905 is 50913521.

It is not a de Polignac number, because 12531905 - 2⁴ = 12531889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35942 + ... + 36288.

It is an arithmetic number, because the mean of its divisors is an integer number (977184).

Almost surely, 2^12531905 is an apocalyptic number.

It is an amenable number.

12531905 is a deficient number, since it is larger than the sum of its proper divisors (3103039).

12531905 is a wasteful number, since it uses less digits than its factorization.

12531905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 12531905 is about 3540.0430788339. The cubic root of 12531905 is about 232.2767271143.

The spelling of 12531905 in words is "twelve million, five hundred thirty-one thousand, nine hundred five".