2161993 has 4 divisors (see below), whose sum is σ = 2189440. Its totient is φ = 2134548.

The previous prime is 2161987. The next prime is 2162003. The reversal of 2161993 is 3991612.

2161993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2161993 - 2¹⁷ = 2030921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161903) 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 3 ways as a sum of consecutive naturals, for example, 13605 + ... + 13762.

It is an arithmetic number, because the mean of its divisors is an integer number (547360).

2^2161993 is an apocalyptic number.

It is an amenable number.

2161993 is a deficient number, since it is larger than the sum of its proper divisors (27447).

2161993 is an equidigital number, since it uses as much as digits as its factorization.

2161993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27446.

The product of its digits is 2916, while the sum is 31.

The square root of 2161993 is about 1470.3717217085. The cubic root of 2161993 is about 129.3058264798.

It can be divided in two parts, 21619 and 93, that added together give a palindrome (21712).

The spelling of 2161993 in words is "two million, one hundred sixty-one thousand, nine hundred ninety-three".