3216161 has 8 divisors (see below), whose sum is σ = 3512040. Its totient is φ = 2927232.

The previous prime is 3216139. The next prime is 3216197. The reversal of 3216161 is 1616123.

It can be written as a sum of positive squares in 4 ways, for example, as 844561 + 2371600 = 919^2 + 1540^2 .

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 3216161 - 2¹⁰ = 3215137 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3216121) 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, 746 + ... + 2643.

It is an arithmetic number, because the mean of its divisors is an integer number (439005).

Almost surely, 2^3216161 is an apocalyptic number.

It is an amenable number.

3216161 is a deficient number, since it is larger than the sum of its proper divisors (295879).

3216161 is a wasteful number, since it uses less digits than its factorization.

3216161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3475.

The product of its digits is 216, while the sum is 20.

The square root of 3216161 is about 1793.3658299410. The cubic root of 3216161 is about 147.6089169683.

The spelling of 3216161 in words is "three million, two hundred sixteen thousand, one hundred sixty-one".