3321661 has 6 divisors (see below), whose sum is σ = 3864030. Its totient is φ = 2847096.

The previous prime is 3321653. The next prime is 3321667. The reversal of 3321661 is 1661233.

It can be written as a sum of positive squares in only one way, i.e., 3261636 + 60025 = 1806^2 + 245^2 .

It is not a de Polignac number, because 3321661 - 2³ = 3321653 is a prime.

It is a super-2 number, since 2×3321661² = 22066863597842, which contains 22 as substring.

It is a Duffinian number.

3321661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3321667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33846 + ... + 33943.

It is an arithmetic number, because the mean of its divisors is an integer number (644005).

Almost surely, 2^3321661 is an apocalyptic number.

It is an amenable number.

3321661 is a deficient number, since it is larger than the sum of its proper divisors (542369).

3321661 is an equidigital number, since it uses as much as digits as its factorization.

3321661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67803 (or 67796 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

The square root of 3321661 is about 1822.5424549239. The cubic root of 3321661 is about 149.2055928012.

Adding to 3321661 its reverse (1661233), we get a palindrome (4982894).

The spelling of 3321661 in words is "three million, three hundred twenty-one thousand, six hundred sixty-one".