2171706887 has 16 divisors (see below), whose sum is σ = 2500477440. Its totient is φ = 1847606112.

The previous prime is 2171706841. The next prime is 2171706893. The reversal of 2171706887 is 7886071712.

It is a cyclic number.

It is not a de Polignac number, because 2171706887 - 2¹⁴ = 2171690503 is a prime.

It is a super-3 number, since 3×2171706887³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171702887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 995564 + ... + 997742.

It is an arithmetic number, because the mean of its divisors is an integer number (156279840).

Almost surely, 2^2171706887 is an apocalyptic number.

2171706887 is a deficient number, since it is larger than the sum of its proper divisors (328770553).

2171706887 is a wasteful number, since it uses less digits than its factorization.

2171706887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182.

The product of its (nonzero) digits is 263424, while the sum is 47.

The square root of 2171706887 is about 46601.5760141221. The cubic root of 2171706887 is about 1294.9919523657.

The spelling of 2171706887 in words is "two billion, one hundred seventy-one million, seven hundred six thousand, eight hundred eighty-seven".