2151823 has 4 divisors (see below), whose sum is σ = 2160648. Its totient is φ = 2143000.

The previous prime is 2151817. The next prime is 2151827. The reversal of 2151823 is 3281512.

2151823 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.

It is a cyclic number.

It is not a de Polignac number, because 2151823 - 2⁵ = 2151791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2151794 and 2151803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151827) 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, 4036 + ... + 4537.

It is an arithmetic number, because the mean of its divisors is an integer number (540162).

2^2151823 is an apocalyptic number.

2151823 is a deficient number, since it is larger than the sum of its proper divisors (8825).

2151823 is an equidigital number, since it uses as much as digits as its factorization.

2151823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8824.

The product of its digits is 480, while the sum is 22.

The square root of 2151823 is about 1466.9093359850. The cubic root of 2151823 is about 129.1027564974.

It can be divided in two parts, 215182 and 3, that multiplied together give a palindrome (645546).

The spelling of 2151823 in words is "two million, one hundred fifty-one thousand, eight hundred twenty-three".