12643531 has 8 divisors (see below), whose sum is σ = 13528400. Its totient is φ = 11780640.

The previous prime is 12643513. The next prime is 12643541. The reversal of 12643531 is 13534621.

12643531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12643531 - 2²¹ = 10546379 is a prime.

It is a super-2 number, since 2×12643531² = 319717752295922, 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 = 12643496 and 12643505.

It is not an unprimeable number, because it can be changed into a prime (12643511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4296 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (1691050).

Almost surely, 2^12643531 is an apocalyptic number.

12643531 is a deficient number, since it is larger than the sum of its proper divisors (884869).

12643531 is a wasteful number, since it uses less digits than its factorization.

12643531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10989.

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

The square root of 12643531 is about 3555.7743179229. The cubic root of 12643531 is about 232.9643458249.

The spelling of 12643531 in words is "twelve million, six hundred forty-three thousand, five hundred thirty-one".