2011943 has 4 divisors (see below), whose sum is σ = 2042040. Its totient is φ = 1981848.

The previous prime is 2011939. The next prime is 2011951. The reversal of 2011943 is 3491102.

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

It is a cyclic number.

It is not a de Polignac number, because 2011943 - 2² = 2011939 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14948 + ... + 15081.

It is an arithmetic number, because the mean of its divisors is an integer number (510510).

2^2011943 is an apocalyptic number.

2011943 is a deficient number, since it is larger than the sum of its proper divisors (30097).

2011943 is an equidigital number, since it uses as much as digits as its factorization.

2011943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30096.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2011943 is about 1418.4297656211. The cubic root of 2011943 is about 126.2423947319.

The spelling of 2011943 in words is "two million, eleven thousand, nine hundred forty-three".