11491218 has 54 divisors (see below), whose sum is σ = 27023061. Its totient is φ = 3528384.

The previous prime is 11491217. The next prime is 11491223. The reversal of 11491218 is 81219411.

It can be written as a sum of positive squares in 2 ways, for example, as 10517049 + 974169 = 3243^2 + 987^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2397.

It is a super-2 number, since 2×11491218² = 264096182247048, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11491191 and 11491200.

It is not an unprimeable number, because it can be changed into a prime (11491217) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 244471 + ... + 244517.

Almost surely, 2^11491218 is an apocalyptic number.

11491218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11491218

11491218 is an abundant number, since it is smaller than the sum of its proper divisors (15531843).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11491218 is a wasteful number, since it uses less digits than its factorization.

11491218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 69 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 11491218 is about 3389.8699090083. The cubic root of 11491218 is about 225.6604004940.

The spelling of 11491218 in words is "eleven million, four hundred ninety-one thousand, two hundred eighteen".