2078181 has 12 divisors (see below), whose sum is σ = 3430752. Its totient is φ = 1187496.

The previous prime is 2078177. The next prime is 2078191. The reversal of 2078181 is 1818702.

It is not a de Polignac number, because 2078181 - 2² = 2078177 is a prime.

It is a super-2 number, since 2×2078181² = 8637672537522, which contains 22 as substring.

It is an Ulam number.

2078181 is a modest number, since divided by 8181 gives 207 as remainder.

2078181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2078161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16431 + ... + 16556.

It is an arithmetic number, because the mean of its divisors is an integer number (285896).

2^2078181 is an apocalyptic number.

2078181 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2078181 is a deficient number, since it is larger than the sum of its proper divisors (1352571).

2078181 is a wasteful number, since it uses less digits than its factorization.

2078181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33000 (or 32997 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 2078181 is about 1441.5897474663. The cubic root of 2078181 is about 127.6128643064.

The spelling of 2078181 in words is "two million, seventy-eight thousand, one hundred eighty-one".