2085581 has 4 divisors (see below), whose sum is σ = 2089692. Its totient is φ = 2081472.

The previous prime is 2085569. The next prime is 2085599. The reversal of 2085581 is 1855802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1713481 + 372100 = 1309^2 + 610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2085581 is a prime.

It is a super-2 number, since 2×2085581² = 8699296215122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2085511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166 + ... + 2351.

It is an arithmetic number, because the mean of its divisors is an integer number (522423).

2^2085581 is an apocalyptic number.

It is an amenable number.

2085581 is a deficient number, since it is larger than the sum of its proper divisors (4111).

2085581 is an equidigital number, since it uses as much as digits as its factorization.

2085581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4110.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 2085581 is about 1444.1540776524. The cubic root of 2085581 is about 127.7641531086.

The spelling of 2085581 in words is "two million, eighty-five thousand, five hundred eighty-one".