2045581 has 8 divisors (see below), whose sum is σ = 2121984. Its totient is φ = 1970640.

The previous prime is 2045569. The next prime is 2045587. The reversal of 2045581 is 1855402.

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 2045581 - 2¹⁷ = 1914509 is a prime.

It is a super-2 number, since 2×2045581² = 8368803255122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045587) 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, 3031 + ... + 3643.

It is an arithmetic number, because the mean of its divisors is an integer number (265248).

2^2045581 is an apocalyptic number.

It is an amenable number.

2045581 is a deficient number, since it is larger than the sum of its proper divisors (76403).

2045581 is an equidigital number, since it uses as much as digits as its factorization.

2045581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 2045581 is about 1430.2380920672. The cubic root of 2045581 is about 126.9420654598.

The spelling of 2045581 in words is "two million, forty-five thousand, five hundred eighty-one".