11643491 has 4 divisors (see below), whose sum is σ = 11657184. Its totient is φ = 11629800.

The previous prime is 11643481. The next prime is 11643509. The reversal of 11643491 is 19434611.

11643491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11643491 - 2²² = 7449187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11643421) 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, 5480 + ... + 7301.

It is an arithmetic number, because the mean of its divisors is an integer number (2914296).

Almost surely, 2^11643491 is an apocalyptic number.

11643491 is a deficient number, since it is larger than the sum of its proper divisors (13693).

11643491 is an equidigital number, since it uses as much as digits as its factorization.

11643491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13692.

The product of its digits is 2592, while the sum is 29.

The square root of 11643491 is about 3412.2559986027. The cubic root of 11643491 is about 226.6527906250.

The spelling of 11643491 in words is "eleven million, six hundred forty-three thousand, four hundred ninety-one".