2011555 has 16 divisors (see below), whose sum is σ = 2971584. Its totient is φ = 1272960.

The previous prime is 2011543. The next prime is 2011561. The reversal of 2011555 is 5551102.

It is not a de Polignac number, because 2011555 - 2¹³ = 2003363 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756 + ... + 2665.

It is an arithmetic number, because the mean of its divisors is an integer number (185724).

2^2011555 is an apocalyptic number.

2011555 is a deficient number, since it is larger than the sum of its proper divisors (960029).

2011555 is a wasteful number, since it uses less digits than its factorization.

2011555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 2011555 is about 1418.2929880670. The cubic root of 2011555 is about 126.2342789953.

Adding to 2011555 its reverse (5551102), we get a palindrome (7562657).

The spelling of 2011555 in words is "two million, eleven thousand, five hundred fifty-five".