3318661 has 4 divisors (see below), whose sum is σ = 3352972. Its totient is φ = 3284352.

The previous prime is 3318631. The next prime is 3318671. The reversal of 3318661 is 1668133.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2268036 + 1050625 = 1506^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 3318661 - 2⁵ = 3318629 is a prime.

It is a super-2 number, since 2×3318661² = 22027021665842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3318631) 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, 17010 + ... + 17203.

It is an arithmetic number, because the mean of its divisors is an integer number (838243).

Almost surely, 2^3318661 is an apocalyptic number.

It is an amenable number.

3318661 is a deficient number, since it is larger than the sum of its proper divisors (34311).

3318661 is an equidigital number, since it uses as much as digits as its factorization.

3318661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34310.

The product of its digits is 2592, while the sum is 28.

The square root of 3318661 is about 1821.7192429131. The cubic root of 3318661 is about 149.1606603007.

The spelling of 3318661 in words is "three million, three hundred eighteen thousand, six hundred sixty-one".