2182561 has 2 divisors, whose sum is σ = 2182562. Its totient is φ = 2182560.

The previous prime is 2182559. The next prime is 2182567. The reversal of 2182561 is 1652812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 65536 = 1455^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 2182561 - 2¹ = 2182559 is a prime.

Together with 2182559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2182567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1091280 + 1091281.

It is an arithmetic number, because the mean of its divisors is an integer number (1091281).

2^2182561 is an apocalyptic number.

It is an amenable number.

2182561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2182561 is an equidigital number, since it uses as much as digits as its factorization.

2182561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 25.

The square root of 2182561 is about 1477.3493154972. The cubic root of 2182561 is about 129.7145809126.

The spelling of 2182561 in words is "two million, one hundred eighty-two thousand, five hundred sixty-one".