2118081 has 24 divisors (see below), whose sum is σ = 3438400. Its totient is φ = 1135872.

The previous prime is 2118079. The next prime is 2118089. The reversal of 2118081 is 1808112.

It is not a de Polignac number, because 2118081 - 2¹ = 2118079 is a prime.

It is a super-2 number, since 2×2118081² = 8972534245122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2118089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5895 + ... + 6243.

2^2118081 is an apocalyptic number.

2118081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2118081 is a deficient number, since it is larger than the sum of its proper divisors (1320319).

2118081 is a wasteful number, since it uses less digits than its factorization.

2118081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 2118081 is about 1455.3628413561. The cubic root of 2118081 is about 128.4243929355.

The spelling of 2118081 in words is "two million, one hundred eighteen thousand, eighty-one".