2102565 has 8 divisors (see below), whose sum is σ = 3364128. Its totient is φ = 1121360.

The previous prime is 2102561. The next prime is 2102567. The reversal of 2102565 is 5652012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2102565 - 2² = 2102561 is a prime.

2102565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70071 + ... + 70100.

It is an arithmetic number, because the mean of its divisors is an integer number (420516).

2^2102565 is an apocalyptic number.

It is an amenable number.

2102565 is a deficient number, since it is larger than the sum of its proper divisors (1261563).

2102565 is a wasteful number, since it uses less digits than its factorization.

2102565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140179.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2102565 is about 1450.0224136199. The cubic root of 2102565 is about 128.1100331516.

Adding to 2102565 its reverse (5652012), we get a palindrome (7754577).

It can be divided in two parts, 210 and 2565, that added together give a triangular number (2775 = T₇₄).

The spelling of 2102565 in words is "two million, one hundred two thousand, five hundred sixty-five".