2170861 has 16 divisors (see below), whose sum is σ = 2740608. Its totient is φ = 1684320.

The previous prime is 2170829. The next prime is 2170871. The reversal of 2170861 is 1680712.

It is not a de Polignac number, because 2170861 - 2⁵ = 2170829 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 (2170871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9201 + ... + 9433.

It is an arithmetic number, because the mean of its divisors is an integer number (171288).

2^2170861 is an apocalyptic number.

It is an amenable number.

2170861 is a deficient number, since it is larger than the sum of its proper divisors (569747).

2170861 is an equidigital number, since it uses as much as digits as its factorization.

2170861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 251 counting only the distinct ones).

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

The square root of 2170861 is about 1473.3841997252. The cubic root of 2170861 is about 129.4823795985.

The spelling of 2170861 in words is "two million, one hundred seventy thousand, eight hundred sixty-one".