2155563 has 12 divisors (see below), whose sum is σ = 3173040. Its totient is φ = 1409616.

The previous prime is 2155519. The next prime is 2155579. The reversal of 2155563 is 3655512.

It is not a de Polignac number, because 2155563 - 2⁶ = 2155499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2155513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1783 + ... + 2736.

It is an arithmetic number, because the mean of its divisors is an integer number (264420).

2^2155563 is an apocalyptic number.

2155563 is a deficient number, since it is larger than the sum of its proper divisors (1017477).

2155563 is a wasteful number, since it uses less digits than its factorization.

2155563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4578 (or 4575 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 2155563 is about 1468.1835716286. The cubic root of 2155563 is about 129.1775093684.

It can be divided in two parts, 215 and 5563, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 2155563 in words is "two million, one hundred fifty-five thousand, five hundred sixty-three".