2081645 has 8 divisors (see below), whose sum is σ = 2509056. Its totient is φ = 1657936.

The previous prime is 2081627. The next prime is 2081647. The reversal of 2081645 is 5461802.

2081645 = T₉₁₀ + T₉₁₁ + ... + T₉₁₄.

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 2081645 - 2⁶ = 2081581 is a prime.

It is a super-3 number, since 3×2081645³ = 27060839022142233375, which contains 333 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 (2081647) 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, 524 + ... + 2106.

It is an arithmetic number, because the mean of its divisors is an integer number (313632).

2^2081645 is an apocalyptic number.

It is an amenable number.

2081645 is a deficient number, since it is larger than the sum of its proper divisors (427411).

2081645 is a wasteful number, since it uses less digits than its factorization.

2081645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2081645 is about 1442.7906986115. The cubic root of 2081645 is about 127.6837284546.

The spelling of 2081645 in words is "two million, eighty-one thousand, six hundred forty-five".