11809491 has 8 divisors (see below), whose sum is σ = 15794064. Its totient is φ = 7848960.

The previous prime is 11809453. The next prime is 11809493. The reversal of 11809491 is 19490811.

11809491 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 not a de Polignac number, because 11809491 - 2²² = 7615187 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (11809493) 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, 4830 + ... + 6851.

It is an arithmetic number, because the mean of its divisors is an integer number (1974258).

Almost surely, 2^11809491 is an apocalyptic number.

11809491 is a deficient number, since it is larger than the sum of its proper divisors (3984573).

11809491 is a wasteful number, since it uses less digits than its factorization.

11809491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12021.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 11809491 is about 3436.4939982488. The cubic root of 11809491 is about 227.7248334787.

The spelling of 11809491 in words is "eleven million, eight hundred nine thousand, four hundred ninety-one".