2180561 has 8 divisors (see below), whose sum is σ = 2298240. Its totient is φ = 2064832.

The previous prime is 2180557. The next prime is 2180569. The reversal of 2180561 is 1650812.

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

It is a cyclic number.

It is not a de Polignac number, because 2180561 - 2² = 2180557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2180569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2180 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (287280).

2^2180561 is an apocalyptic number.

It is an amenable number.

2180561 is a deficient number, since it is larger than the sum of its proper divisors (117679).

2180561 is a wasteful number, since it uses less digits than its factorization.

2180561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2180561 is about 1476.6722723746. The cubic root of 2180561 is about 129.6749472826.

The spelling of 2180561 in words is "two million, one hundred eighty thousand, five hundred sixty-one".