2215231 has 4 divisors (see below), whose sum is σ = 2266792. Its totient is φ = 2163672.

The previous prime is 2215217. The next prime is 2215237. The reversal of 2215231 is 1325122.

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 2215231 - 2¹³ = 2207039 is a prime.

It is a super-2 number, since 2×2215231² = 9814496766722, which contains 22 as substring.

It is a Duffinian number.

2215231 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215237) 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, 25716 + ... + 25801.

It is an arithmetic number, because the mean of its divisors is an integer number (566698).

2^2215231 is an apocalyptic number.

2215231 is a deficient number, since it is larger than the sum of its proper divisors (51561).

2215231 is an equidigital number, since it uses as much as digits as its factorization.

2215231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51560.

The product of its digits is 120, while the sum is 16.

The square root of 2215231 is about 1488.3652105582. The cubic root of 2215231 is about 130.3585957286.

The spelling of 2215231 in words is "two million, two hundred fifteen thousand, two hundred thirty-one".