2171087 has 4 divisors (see below), whose sum is σ = 2298816. Its totient is φ = 2043360.

The previous prime is 2171077. The next prime is 2171089. The reversal of 2171087 is 7801712.

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

It is a cyclic number.

It is not a de Polignac number, because 2171087 - 2¹⁸ = 1908943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63839 + ... + 63872.

It is an arithmetic number, because the mean of its divisors is an integer number (574704).

2^2171087 is an apocalyptic number.

2171087 is a deficient number, since it is larger than the sum of its proper divisors (127729).

2171087 is a wasteful number, since it uses less digits than its factorization.

2171087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127728.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 2171087 is about 1473.4608919140. The cubic root of 2171087 is about 129.4868727470.

Adding to 2171087 its reverse (7801712), we get a palindrome (9972799).

The spelling of 2171087 in words is "two million, one hundred seventy-one thousand, eighty-seven".