2158641 has 6 divisors (see below), whose sum is σ = 3118050. Its totient is φ = 1439088.

The previous prime is 2158631. The next prime is 2158649. The reversal of 2158641 is 1468512.

2158641 is a `hidden beast` number, since 2 + 15 + 8 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 41616 = 1455^2 + 204^2 .

It is not a de Polignac number, because 2158641 - 2⁶ = 2158577 is a prime.

It is a Curzon number.

2158641 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119916 + ... + 119933.

It is an arithmetic number, because the mean of its divisors is an integer number (519675).

2^2158641 is an apocalyptic number.

It is an amenable number.

2158641 is a deficient number, since it is larger than the sum of its proper divisors (959409).

2158641 is a wasteful number, since it uses less digits than its factorization.

2158641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239855 (or 239852 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 2158641 is about 1469.2314317357. The cubic root of 2158641 is about 129.2389657445.

The spelling of 2158641 in words is "two million, one hundred fifty-eight thousand, six hundred forty-one".