2161659 has 8 divisors (see below), whose sum is σ = 2889040. Its totient is φ = 1437696.

The previous prime is 2161639. The next prime is 2161697. The reversal of 2161659 is 9561612.

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

It is not a de Polignac number, because 2161659 - 2¹² = 2157563 is a prime.

It is a Duffinian number.

2161659 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2161639) 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, 1839 + ... + 2775.

It is an arithmetic number, because the mean of its divisors is an integer number (361130).

2^2161659 is an apocalyptic number.

2161659 is a deficient number, since it is larger than the sum of its proper divisors (727381).

2161659 is an equidigital number, since it uses as much as digits as its factorization.

2161659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709.

The product of its digits is 3240, while the sum is 30.

The square root of 2161659 is about 1470.2581405998. The cubic root of 2161659 is about 129.2991674434.

The spelling of 2161659 in words is "two million, one hundred sixty-one thousand, six hundred fifty-nine".