3217661 has 4 divisors (see below), whose sum is σ = 3256512. Its totient is φ = 3178812.

The previous prime is 3217633. The next prime is 3217663. The reversal of 3217661 is 1667123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1667123 = 29 ⋅57487.

It is a cyclic number.

It is not a de Polignac number, because 3217661 - 2¹⁰ = 3216637 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 3217661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3217663) 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, 19301 + ... + 19466.

It is an arithmetic number, because the mean of its divisors is an integer number (814128).

Almost surely, 2^3217661 is an apocalyptic number.

It is an amenable number.

3217661 is a deficient number, since it is larger than the sum of its proper divisors (38851).

3217661 is an equidigital number, since it uses as much as digits as its factorization.

3217661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38850.

The product of its digits is 1512, while the sum is 26.

The square root of 3217661 is about 1793.7839892250. The cubic root of 3217661 is about 147.6318614003.

The spelling of 3217661 in words is "three million, two hundred seventeen thousand, six hundred sixty-one".