3561605 has 4 divisors (see below), whose sum is σ = 4273932. Its totient is φ = 2849280.

The previous prime is 3561581. The next prime is 3561611. The reversal of 3561605 is 5061653.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5061653 = 281 ⋅18013.

It can be written as a sum of positive squares in 2 ways, for example, as 894916 + 2666689 = 946^2 + 1633^2 .

It is not a de Polignac number, because 3561605 - 2⁶ = 3561541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356156 + ... + 356165.

It is an arithmetic number, because the mean of its divisors is an integer number (1068483).

Almost surely, 2^3561605 is an apocalyptic number.

It is an amenable number.

3561605 is a deficient number, since it is larger than the sum of its proper divisors (712327).

3561605 is an equidigital number, since it uses as much as digits as its factorization.

3561605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712326.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 3561605 is about 1887.2215026329. The cubic root of 3561605 is about 152.7150776935.

The spelling of 3561605 in words is "three million, five hundred sixty-one thousand, six hundred five".