11691819 has 12 divisors (see below), whose sum is σ = 16918096. Its totient is φ = 7780752.

The previous prime is 11691793. The next prime is 11691851. The reversal of 11691819 is 91819611.

It is not a de Polignac number, because 11691819 - 2⁵ = 11691787 is a prime.

It is a super-2 number, since 2×11691819² = 273397263057522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11691419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8322 + ... + 9624.

Almost surely, 2^11691819 is an apocalyptic number.

11691819 is a deficient number, since it is larger than the sum of its proper divisors (5226277).

11691819 is a wasteful number, since it uses less digits than its factorization.

11691819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2303 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 11691819 is about 3419.3301975679. The cubic root of 11691819 is about 226.9659428681.

The spelling of 11691819 in words is "eleven million, six hundred ninety-one thousand, eight hundred nineteen".