2158241 has 4 divisors (see below), whose sum is σ = 2193684. Its totient is φ = 2122800.

The previous prime is 2158237. The next prime is 2158259. The reversal of 2158241 is 1428512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 883600 + 1274641 = 940^2 + 1129^2 .

It is not a de Polignac number, because 2158241 - 2² = 2158237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (2158231) 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, 17630 + ... + 17751.

It is an arithmetic number, because the mean of its divisors is an integer number (548421).

2^2158241 is an apocalyptic number.

It is an amenable number.

2158241 is a deficient number, since it is larger than the sum of its proper divisors (35443).

2158241 is an equidigital number, since it uses as much as digits as its factorization.

2158241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35442.

The product of its digits is 640, while the sum is 23.

The square root of 2158241 is about 1469.0952998359. The cubic root of 2158241 is about 129.2309825150.

The spelling of 2158241 in words is "two million, one hundred fifty-eight thousand, two hundred forty-one".