2145505 has 4 divisors (see below), whose sum is σ = 2574612. Its totient is φ = 1716400.

The previous prime is 2145497. The next prime is 2145529. The reversal of 2145505 is 5055412.

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 839056 + 1306449 = 916^2 + 1143^2 .

It is not a de Polignac number, because 2145505 - 2³ = 2145497 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214546 + ... + 214555.

It is an arithmetic number, because the mean of its divisors is an integer number (643653).

2^2145505 is an apocalyptic number.

It is an amenable number.

2145505 is a deficient number, since it is larger than the sum of its proper divisors (429107).

2145505 is an equidigital number, since it uses as much as digits as its factorization.

2145505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429106.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 2145505 is about 1464.7542455989. The cubic root of 2145505 is about 128.9762791150.

The spelling of 2145505 in words is "two million, one hundred forty-five thousand, five hundred five".