4091609 has 2 divisors, whose sum is σ = 4091610. Its totient is φ = 4091608.

The previous prime is 4091603. The next prime is 4091621. The reversal of 4091609 is 9061904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3097600 + 994009 = 1760^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 4091609 - 2¹² = 4087513 is a prime.

It is not a weakly prime, because it can be changed into another prime (4091603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045804 + 2045805.

It is an arithmetic number, because the mean of its divisors is an integer number (2045805).

Almost surely, 2^4091609 is an apocalyptic number.

It is an amenable number.

4091609 is a deficient number, since it is larger than the sum of its proper divisors (1).

4091609 is an equidigital number, since it uses as much as digits as its factorization.

4091609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 4091609 is about 2022.7726021479. The cubic root of 4091609 is about 159.9428050779.

The spelling of 4091609 in words is "four million, ninety-one thousand, six hundred nine".