2145565 has 8 divisors (see below), whose sum is σ = 2663640. Its totient is φ = 1657152.

The previous prime is 2145551. The next prime is 2145617. The reversal of 2145565 is 5655412.

2145565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 148996 + 1996569 = 386^2 + 1413^2 .

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 2145565 - 2¹¹ = 2143517 is a prime.

2145565 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7254 + ... + 7543.

It is an arithmetic number, because the mean of its divisors is an integer number (332955).

2^2145565 is an apocalyptic number.

It is an amenable number.

2145565 is a deficient number, since it is larger than the sum of its proper divisors (518075).

2145565 is a wasteful number, since it uses less digits than its factorization.

2145565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14831.

The product of its digits is 6000, while the sum is 28.

The square root of 2145565 is about 1464.7747267071. The cubic root of 2145565 is about 128.9774813967.

The spelling of 2145565 in words is "two million, one hundred forty-five thousand, five hundred sixty-five".