2170661 has 4 divisors (see below), whose sum is σ = 2174400. Its totient is φ = 2166924.

The previous prime is 2170657. The next prime is 2170667. The reversal of 2170661 is 1660712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2170661 - 2² = 2170657 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 (2170667) 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, 791 + ... + 2228.

It is an arithmetic number, because the mean of its divisors is an integer number (543600).

2^2170661 is an apocalyptic number.

It is an amenable number.

2170661 is a deficient number, since it is larger than the sum of its proper divisors (3739).

2170661 is an equidigital number, since it uses as much as digits as its factorization.

2170661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3738.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 2170661 is about 1473.3163272020. The cubic root of 2170661 is about 129.4784031008.

The spelling of 2170661 in words is "two million, one hundred seventy thousand, six hundred sixty-one".