11491819 has 4 divisors (see below), whose sum is σ = 11498760. Its totient is φ = 11484880.

The previous prime is 11491807. The next prime is 11491841. The reversal of 11491819 is 91819411.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91819411 = 8161 ⋅11251.

It is a cyclic number.

It is not a de Polignac number, because 11491819 - 2⁵ = 11491787 is a prime.

It is a super-2 number, since 2×11491819² = 264123807857522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11491889) 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, 624 + ... + 4834.

It is an arithmetic number, because the mean of its divisors is an integer number (2874690).

Almost surely, 2^11491819 is an apocalyptic number.

11491819 is a deficient number, since it is larger than the sum of its proper divisors (6941).

11491819 is an equidigital number, since it uses as much as digits as its factorization.

11491819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6940.

The product of its digits is 2592, while the sum is 34.

The square root of 11491819 is about 3389.9585543189. The cubic root of 11491819 is about 225.6643344993.

The spelling of 11491819 in words is "eleven million, four hundred ninety-one thousand, eight hundred nineteen".