2113181 has 16 divisors (see below), whose sum is σ = 2553600. Its totient is φ = 1710720.

The previous prime is 2113159. The next prime is 2113187. The reversal of 2113181 is 1813112.

2113181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2113181 is a prime.

It is a super-2 number, since 2×2113181² = 8931067877522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10520 + ... + 10718.

It is an arithmetic number, because the mean of its divisors is an integer number (159600).

2^2113181 is an apocalyptic number.

It is an amenable number.

2113181 is a deficient number, since it is larger than the sum of its proper divisors (440419).

2113181 is a wasteful number, since it uses less digits than its factorization.

2113181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284.

The product of its digits is 48, while the sum is 17.

The square root of 2113181 is about 1453.6784376195. The cubic root of 2113181 is about 128.3252835040.

Adding to 2113181 its reverse (1813112), we get a palindrome (3926293).

It can be divided in two parts, 21131 and 81, that added together give a palindrome (21212).

The spelling of 2113181 in words is "two million, one hundred thirteen thousand, one hundred eighty-one".