2102566 has 4 divisors (see below), whose sum is σ = 3153852. Its totient is φ = 1051282.

The previous prime is 2102561. The next prime is 2102567. The reversal of 2102566 is 6652012.

It is a semiprime because it is the product of two primes.

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 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 as a sum of consecutive naturals, namely, 525640 + ... + 525643.

It is an arithmetic number, because the mean of its divisors is an integer number (788463).

2^2102566 is an apocalyptic number.

2102566 is a deficient number, since it is larger than the sum of its proper divisors (1051286).

2102566 is a wasteful number, since it uses less digits than its factorization.

2102566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051285.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2102566 is about 1450.0227584421. The cubic root of 2102566 is about 128.1100534617.

Adding to 2102566 its reverse (6652012), we get a palindrome (8754578).

The spelling of 2102566 in words is "two million, one hundred two thousand, five hundred sixty-six".