2109659 has 4 divisors (see below), whose sum is σ = 2113104. Its totient is φ = 2106216.

The previous prime is 2109647. The next prime is 2109671. The reversal of 2109659 is 9569012.

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

It is an interprime number because it is at equal distance from previous prime (2109647) and next prime (2109671).

It is a cyclic number.

It is not a de Polignac number, because 2109659 - 2⁸ = 2109403 is a prime.

It is a super-2 number, since 2×2109659² = 8901322192562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2109619) 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, 527 + ... + 2120.

It is an arithmetic number, because the mean of its divisors is an integer number (528276).

2^2109659 is an apocalyptic number.

2109659 is a deficient number, since it is larger than the sum of its proper divisors (3445).

2109659 is an equidigital number, since it uses as much as digits as its factorization.

2109659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 2109659 is about 1452.4665228500. The cubic root of 2109659 is about 128.2539513948.

It can be divided in two parts, 2109 and 659, that multiplied together give a palindrome (1389831).

The spelling of 2109659 in words is "two million, one hundred nine thousand, six hundred fifty-nine".