3213661 has 8 divisors (see below), whose sum is σ = 3525984. Its totient is φ = 2904720.

The previous prime is 3213659. The next prime is 3213689. The reversal of 3213661 is 1663123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3213661 - 2¹ = 3213659 is a prime.

3213661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3213961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1426 + ... + 2908.

It is an arithmetic number, because the mean of its divisors is an integer number (440748).

Almost surely, 2^3213661 is an apocalyptic number.

It is an amenable number.

3213661 is a deficient number, since it is larger than the sum of its proper divisors (312323).

3213661 is a wasteful number, since it uses less digits than its factorization.

3213661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

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

The square root of 3213661 is about 1792.6686810451. The cubic root of 3213661 is about 147.5706603894.

Adding to 3213661 its reverse (1663123), we get a palindrome (4876784).

The spelling of 3213661 in words is "three million, two hundred thirteen thousand, six hundred sixty-one".