3581609 has 2 divisors, whose sum is σ = 3581610. Its totient is φ = 3581608.

The previous prime is 3581597. The next prime is 3581621. The reversal of 3581609 is 9061853.

It is a balanced prime because it is at equal distance from previous prime (3581597) and next prime (3581621).

It can be written as a sum of positive squares in only one way, i.e., 2650384 + 931225 = 1628^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 3581609 - 2⁴ = 3581593 is a prime.

It is not a weakly prime, because it can be changed into another prime (3581639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1790804 + 1790805.

It is an arithmetic number, because the mean of its divisors is an integer number (1790805).

Almost surely, 2^3581609 is an apocalyptic number.

It is an amenable number.

3581609 is a deficient number, since it is larger than the sum of its proper divisors (1).

3581609 is an equidigital number, since it uses as much as digits as its factorization.

3581609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 3581609 is about 1892.5139365405. The cubic root of 3581609 is about 153.0004556638. Note that the first 3 decimals are identical.

Subtracting from 3581609 its sum of digits (32), we obtain a cube (3581577 = 153³).

The spelling of 3581609 in words is "three million, five hundred eighty-one thousand, six hundred nine".