12663531 has 12 divisors (see below), whose sum is σ = 18882240. Its totient is φ = 8169840.

The previous prime is 12663493. The next prime is 12663569. The reversal of 12663531 is 13536621.

12663531 is a `hidden beast` number, since 1 + 26 + 635 + 3 + 1 = 666.

12663531 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12663493) and next prime (12663569).

It is not a de Polignac number, because 12663531 - 2⁶ = 12663467 is a prime.

It is a super-2 number, since 2×12663531² = 320730034775922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12663495 and 12663504.

It is not an unprimeable number, because it can be changed into a prime (12663331) 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 11 ways as a sum of consecutive naturals, for example, 22416 + ... + 22973.

It is an arithmetic number, because the mean of its divisors is an integer number (1573520).

Almost surely, 2^12663531 is an apocalyptic number.

12663531 is a deficient number, since it is larger than the sum of its proper divisors (6218709).

12663531 is a wasteful number, since it uses less digits than its factorization.

12663531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45426 (or 45423 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 12663531 is about 3558.5855336074. The cubic root of 12663531 is about 233.0871182880.

The spelling of 12663531 in words is "twelve million, six hundred sixty-three thousand, five hundred thirty-one".