4391609 has 2 divisors, whose sum is σ = 4391610. Its totient is φ = 4391608.

The previous prime is 4391591. The next prime is 4391617. The reversal of 4391609 is 9061934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3385600 + 1006009 = 1840^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 4391609 - 2⁸ = 4391353 is a prime.

It is not a weakly prime, because it can be changed into another prime (4391659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2195804 + 2195805.

It is an arithmetic number, because the mean of its divisors is an integer number (2195805).

Almost surely, 2^4391609 is an apocalyptic number.

It is an amenable number.

4391609 is a deficient number, since it is larger than the sum of its proper divisors (1).

4391609 is an equidigital number, since it uses as much as digits as its factorization.

4391609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 4391609 is about 2095.6166157005. The cubic root of 4391609 is about 163.7600223068.

It can be divided in two parts, 439 and 1609, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 4391609 in words is "four million, three hundred ninety-one thousand, six hundred nine".