2161563 has 8 divisors (see below), whose sum is σ = 3007488. Its totient is φ = 1378344.

The previous prime is 2161553. The next prime is 2161571. The reversal of 2161563 is 3651612.

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

It is not a de Polignac number, because 2161563 - 2¹⁸ = 1899419 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2161513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15595 + ... + 15732.

It is an arithmetic number, because the mean of its divisors is an integer number (375936).

2^2161563 is an apocalyptic number.

2161563 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2161563 is a deficient number, since it is larger than the sum of its proper divisors (845925).

2161563 is a wasteful number, since it uses less digits than its factorization.

2161563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31353.

The product of its digits is 1080, while the sum is 24.

The square root of 2161563 is about 1470.2254929092. The cubic root of 2161563 is about 129.2972533419.

The spelling of 2161563 in words is "two million, one hundred sixty-one thousand, five hundred sixty-three".