2101687 has 8 divisors (see below), whose sum is σ = 2424096. Its totient is φ = 1784832.

The previous prime is 2101681. The next prime is 2101703. The reversal of 2101687 is 7861012.

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

It is a de Polignac number, because none of the positive numbers 2^k-2101687 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (303012).

2^2101687 is an apocalyptic number.

2101687 is a deficient number, since it is larger than the sum of its proper divisors (322409).

2101687 is a wasteful number, since it uses less digits than its factorization.

2101687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 2101687 is about 1449.7196280661. The cubic root of 2101687 is about 128.0921983848.

Adding to 2101687 its reverse (7861012), we get a palindrome (9962699).

The spelling of 2101687 in words is "two million, one hundred one thousand, six hundred eighty-seven".