2153231 has 4 divisors (see below), whose sum is σ = 2193912. Its totient is φ = 2112552.

The previous prime is 2153227. The next prime is 2153243. The reversal of 2153231 is 1323512.

2153231 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 2153231 - 2² = 2153227 is a prime.

It is a super-2 number, since 2×2153231² = 9272807478722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153201) 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, 20261 + ... + 20366.

It is an arithmetic number, because the mean of its divisors is an integer number (548478).

2^2153231 is an apocalyptic number.

2153231 is a deficient number, since it is larger than the sum of its proper divisors (40681).

2153231 is an equidigital number, since it uses as much as digits as its factorization.

2153231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40680.

The product of its digits is 180, while the sum is 17.

The square root of 2153231 is about 1467.3891780983. The cubic root of 2153231 is about 129.1309089134.

Adding to 2153231 its reverse (1323512), we get a palindrome (3476743).

The spelling of 2153231 in words is "two million, one hundred fifty-three thousand, two hundred thirty-one".