11543643 has 6 divisors (see below), whose sum is σ = 16674164. Its totient is φ = 7695756.

The previous prime is 11543641. The next prime is 11543647. The reversal of 11543643 is 34634511.

11543643 is a `hidden beast` number, since 1 + 15 + 4 + 3 + 643 = 666.

It is not a de Polignac number, because 11543643 - 2¹ = 11543641 is a prime.

It is a super-2 number, since 2×11543643² = 266511387422898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11543641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 641305 + ... + 641322.

Almost surely, 2^11543643 is an apocalyptic number.

11543643 is a deficient number, since it is larger than the sum of its proper divisors (5130521).

11543643 is a wasteful number, since it uses less digits than its factorization.

11543643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282633 (or 1282630 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 11543643 is about 3397.5937073170. The cubic root of 11543643 is about 226.0030477047.

The spelling of 11543643 in words is "eleven million, five hundred forty-three thousand, six hundred forty-three".