2153565 has 12 divisors (see below), whose sum is σ = 3732924. Its totient is φ = 1148544.

The previous prime is 2153563. The next prime is 2153621. The reversal of 2153565 is 5653512.

2153565 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 2 ways, for example, as 974169 + 1179396 = 987^2 + 1086^2 .

It is not a de Polignac number, because 2153565 - 2¹ = 2153563 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153561) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 23884 + ... + 23973.

It is an arithmetic number, because the mean of its divisors is an integer number (311077).

2^2153565 is an apocalyptic number.

It is an amenable number.

2153565 is a deficient number, since it is larger than the sum of its proper divisors (1579359).

2153565 is a wasteful number, since it uses less digits than its factorization.

2153565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47868 (or 47865 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 2153565 is about 1467.5029812576. The cubic root of 2153565 is about 129.1375853133.

The spelling of 2153565 in words is "two million, one hundred fifty-three thousand, five hundred sixty-five".