2159609 has 2 divisors, whose sum is σ = 2159610. Its totient is φ = 2159608.

The previous prime is 2159557. The next prime is 2159621. The reversal of 2159609 is 9069512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2111209 + 48400 = 1453^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 2159609 - 2¹² = 2155513 is a prime.

It is a super-2 number, since 2×2159609² = 9327822065762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2159639) 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 as a sum of consecutive naturals, namely, 1079804 + 1079805.

It is an arithmetic number, because the mean of its divisors is an integer number (1079805).

2^2159609 is an apocalyptic number.

It is an amenable number.

2159609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159609 is an equidigital number, since it uses as much as digits as its factorization.

2159609 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2159609 is about 1469.5608187482. The cubic root of 2159609 is about 129.2582810797.

Subtracting 2159609 from its reverse (9069512), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2159609 in words is "two million, one hundred fifty-nine thousand, six hundred nine".