2155111 has 4 divisors (see below), whose sum is σ = 2462992. Its totient is φ = 1847232.

The previous prime is 2155103. The next prime is 2155121. The reversal of 2155111 is 1115512.

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 2155111 - 2³ = 2155103 is a prime.

2155111 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155121) 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, 153930 + ... + 153943.

It is an arithmetic number, because the mean of its divisors is an integer number (615748).

2^2155111 is an apocalyptic number.

2155111 is a deficient number, since it is larger than the sum of its proper divisors (307881).

2155111 is an equidigital number, since it uses as much as digits as its factorization.

2155111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307880.

The product of its digits is 50, while the sum is 16.

The square root of 2155111 is about 1468.0296318535. The cubic root of 2155111 is about 129.1684796601.

It can be divided in two parts, 215511 and 1, that added together give a palindrome (215512).

The spelling of 2155111 in words is "two million, one hundred fifty-five thousand, one hundred eleven".