2158911 has 6 divisors (see below), whose sum is σ = 3118440. Its totient is φ = 1439268.

The previous prime is 2158909. The next prime is 2158921. The reversal of 2158911 is 1198512.

It is not a de Polignac number, because 2158911 - 2¹ = 2158909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158921) 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, 119931 + ... + 119948.

It is an arithmetic number, because the mean of its divisors is an integer number (519740).

2^2158911 is an apocalyptic number.

2158911 is a deficient number, since it is larger than the sum of its proper divisors (959529).

2158911 is a wasteful number, since it uses less digits than its factorization.

2158911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239885 (or 239882 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 2158911 is about 1469.3233136379. The cubic root of 2158911 is about 129.2443538669.

The spelling of 2158911 in words is "two million, one hundred fifty-eight thousand, nine hundred eleven".