2145085 has 4 divisors (see below), whose sum is σ = 2574108. Its totient is φ = 1716064.

The previous prime is 2145083. The next prime is 2145089. The reversal of 2145085 is 5805412.

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 972196 + 1172889 = 986^2 + 1083^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145085 - 2¹ = 2145083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145083) 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, 214504 + ... + 214513.

It is an arithmetic number, because the mean of its divisors is an integer number (643527).

2^2145085 is an apocalyptic number.

It is an amenable number.

2145085 is a deficient number, since it is larger than the sum of its proper divisors (429023).

2145085 is an equidigital number, since it uses as much as digits as its factorization.

2145085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429022.

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

The square root of 2145085 is about 1464.6108698217. The cubic root of 2145085 is about 128.9678625149.

Subtracting from 2145085 its product of nonzero digits (1600), we obtain a triangular number (2143485 = T₂₀₇₀).

The spelling of 2145085 in words is "two million, one hundred forty-five thousand, eighty-five".