12543631 has 4 divisors (see below), whose sum is σ = 12976200. Its totient is φ = 12111064.

The previous prime is 12543607. The next prime is 12543647. The reversal of 12543631 is 13634521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12543631 - 2²¹ = 10446479 is a prime.

It is a super-2 number, since 2×12543631² = 314685357328322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12543596 and 12543605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216241 + ... + 216298.

It is an arithmetic number, because the mean of its divisors is an integer number (3244050).

Almost surely, 2^12543631 is an apocalyptic number.

12543631 is a deficient number, since it is larger than the sum of its proper divisors (432569).

12543631 is an equidigital number, since it uses as much as digits as its factorization.

12543631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432568.

The product of its digits is 2160, while the sum is 25.

The square root of 12543631 is about 3541.6988861280. The cubic root of 12543631 is about 232.3491510018.

The spelling of 12543631 in words is "twelve million, five hundred forty-three thousand, six hundred thirty-one".