11820358091 has 4 divisors (see below), whose sum is σ = 11820754632. Its totient is φ = 11819961552.

The previous prime is 11820358061. The next prime is 11820358093. The reversal of 11820358091 is 19085302811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19085302811 = 1327 ⋅14382293.

It is a cyclic number.

It is not a de Polignac number, because 11820358091 - 2¹⁴ = 11820341707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11820358093) 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, 149570 + ... + 214503.

It is an arithmetic number, because the mean of its divisors is an integer number (2955188658).

Almost surely, 2^11820358091 is an apocalyptic number.

11820358091 is a deficient number, since it is larger than the sum of its proper divisors (396541).

11820358091 is an equidigital number, since it uses as much as digits as its factorization.

11820358091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396540.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 11820358091 in words is "eleven billion, eight hundred twenty million, three hundred fifty-eight thousand, ninety-one".