11918091 has 4 divisors (see below), whose sum is σ = 15890792. Its totient is φ = 7945392.

The previous prime is 11918087. The next prime is 11918171. The reversal of 11918091 is 19081911.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11918091 - 2² = 11918087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11918051) 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, 1986346 + ... + 1986351.

It is an arithmetic number, because the mean of its divisors is an integer number (3972698).

Almost surely, 2^11918091 is an apocalyptic number.

11918091 is a deficient number, since it is larger than the sum of its proper divisors (3972701).

11918091 is an equidigital number, since it uses as much as digits as its factorization.

11918091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972700.

The product of its (nonzero) digits is 648, while the sum is 30.

The square root of 11918091 is about 3452.2588257545. The cubic root of 11918091 is about 228.4207565970.

It can be divided in two parts, 11 and 918091, that multiplied together give a palindrome (10099001).

The spelling of 11918091 in words is "eleven million, nine hundred eighteen thousand, ninety-one".