2085561 has 8 divisors (see below), whose sum is σ = 3089760. Its totient is φ = 1390356.

The previous prime is 2085539. The next prime is 2085569. The reversal of 2085561 is 1655802.

2085561 is a `hidden beast` number, since 20 + 85 + 561 = 666.

It is not a de Polignac number, because 2085561 - 2⁹ = 2085049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 77243 = 2085561 / (2 + 0 + 8 + 5 + 5 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (2085569) 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, 38595 + ... + 38648.

It is an arithmetic number, because the mean of its divisors is an integer number (386220).

2^2085561 is an apocalyptic number.

It is an amenable number.

2085561 is a deficient number, since it is larger than the sum of its proper divisors (1004199).

2085561 is an equidigital number, since it uses as much as digits as its factorization.

2085561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77252 (or 77246 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2085561 is about 1444.1471531669. The cubic root of 2085561 is about 127.7637447027.

It can be divided in two parts, 2085 and 561, that multiplied together give a triangular number (1169685 = T₁₅₂₉).

The spelling of 2085561 in words is "two million, eighty-five thousand, five hundred sixty-one".