3661603 has 4 divisors (see below), whose sum is σ = 3994488. Its totient is φ = 3328720.

The previous prime is 3661601. The next prime is 3661633. The reversal of 3661603 is 3061663.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3661603 - 2¹ = 3661601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166426 + ... + 166447.

It is an arithmetic number, because the mean of its divisors is an integer number (998622).

Almost surely, 2^3661603 is an apocalyptic number.

3661603 is a deficient number, since it is larger than the sum of its proper divisors (332885).

3661603 is a wasteful number, since it uses less digits than its factorization.

3661603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332884.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 3661603 is about 1913.5315518695. The cubic root of 3661603 is about 154.1311498737.

The spelling of 3661603 in words is "three million, six hundred sixty-one thousand, six hundred three".