326643161 has 4 divisors (see below), whose sum is σ = 351769572. Its totient is φ = 301516752.

The previous prime is 326643143. The next prime is 326643167. The reversal of 326643161 is 161346623.

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 15649936 + 310993225 = 3956^2 + 17635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-326643161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (326643167) 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, 12563186 + ... + 12563211.

It is an arithmetic number, because the mean of its divisors is an integer number (87942393).

Almost surely, 2^326643161 is an apocalyptic number.

It is an amenable number.

326643161 is a deficient number, since it is larger than the sum of its proper divisors (25126411).

326643161 is a wasteful number, since it uses less digits than its factorization.

326643161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25126410.

The product of its digits is 15552, while the sum is 32.

The square root of 326643161 is about 18073.2720059208. The cubic root of 326643161 is about 688.6911834562.

Adding to 326643161 its reverse (161346623), we get a palindrome (487989784).

The spelling of 326643161 in words is "three hundred twenty-six million, six hundred forty-three thousand, one hundred sixty-one".