2011155 has 8 divisors (see below), whose sum is σ = 3217872. Its totient is φ = 1072608.

The previous prime is 2011147. The next prime is 2011171. The reversal of 2011155 is 5511102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2011155 - 2³ = 2011147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 134077 = 2011155 / (2 + 0 + 1 + 1 + 1 + 5 + 5).

It is an Ulam number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67024 + ... + 67053.

It is an arithmetic number, because the mean of its divisors is an integer number (402234).

2^2011155 is an apocalyptic number.

2011155 is a deficient number, since it is larger than the sum of its proper divisors (1206717).

2011155 is a wasteful number, since it uses less digits than its factorization.

2011155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134085.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 2011155 is about 1418.1519664690. The cubic root of 2011155 is about 126.2259111640.

Adding to 2011155 its reverse (5511102), we get a palindrome (7522257).

It can be divided in two parts, 20 and 11155, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 2011155 in words is "two million, eleven thousand, one hundred fifty-five".