2101566 has 16 divisors (see below), whose sum is σ = 4224384. Its totient is φ = 696984.

The previous prime is 2101553. The next prime is 2101607. The reversal of 2101566 is 6651012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591 + ... + 2133.

It is an arithmetic number, because the mean of its divisors is an integer number (264024).

2^2101566 is an apocalyptic number.

2101566 is an abundant number, since it is smaller than the sum of its proper divisors (2122818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101566 is a wasteful number, since it uses less digits than its factorization.

2101566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2101566 is about 1449.6778952581. The cubic root of 2101566 is about 128.0897401289.

Adding to 2101566 its reverse (6651012), we get a palindrome (8752578).

The spelling of 2101566 in words is "two million, one hundred one thousand, five hundred sixty-six".