2181633 has 4 divisors (see below), whose sum is σ = 2908848. Its totient is φ = 1454420.

The previous prime is 2181629. The next prime is 2181649. The reversal of 2181633 is 3361812.

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 2181633 - 2² = 2181629 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2181233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363603 + ... + 363608.

It is an arithmetic number, because the mean of its divisors is an integer number (727212).

2^2181633 is an apocalyptic number.

It is an amenable number.

2181633 is a deficient number, since it is larger than the sum of its proper divisors (727215).

2181633 is an equidigital number, since it uses as much as digits as its factorization.

2181633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727214.

The product of its digits is 864, while the sum is 24.

The square root of 2181633 is about 1477.0352060801. The cubic root of 2181633 is about 129.6961939205.

The spelling of 2181633 in words is "two million, one hundred eighty-one thousand, six hundred thirty-three".