11918131 has 4 divisors (see below), whose sum is σ = 12086064. Its totient is φ = 11750200.

The previous prime is 11918087. The next prime is 11918171. The reversal of 11918131 is 13181911.

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 11918131 - 2¹⁹ = 11393843 is a prime.

It is a super-2 number, since 2×11918131² = 284083693066322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11918096 and 11918105.

It is not an unprimeable number, because it can be changed into a prime (11918171) 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, 83860 + ... + 84001.

It is an arithmetic number, because the mean of its divisors is an integer number (3021516).

Almost surely, 2^11918131 is an apocalyptic number.

11918131 is a deficient number, since it is larger than the sum of its proper divisors (167933).

11918131 is an equidigital number, since it uses as much as digits as its factorization.

11918131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167932.

The product of its digits is 216, while the sum is 25.

The square root of 11918131 is about 3452.2646190580. The cubic root of 11918131 is about 228.4210121418.

The spelling of 11918131 in words is "eleven million, nine hundred eighteen thousand, one hundred thirty-one".