328151221 has 8 divisors (see below), whose sum is σ = 348810840. Its totient is φ = 307642368.

The previous prime is 328151203. The next prime is 328151231. The reversal of 328151221 is 122151823.

It can be written as a sum of positive squares in 4 ways, for example, as 258244900 + 69906321 = 16070^2 + 8361^2 .

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 328151221 - 2¹⁷ = 328020149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328151231) 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, 33186 + ... + 41923.

It is an arithmetic number, because the mean of its divisors is an integer number (43601355).

Almost surely, 2^328151221 is an apocalyptic number.

It is an amenable number.

328151221 is a deficient number, since it is larger than the sum of its proper divisors (20659619).

328151221 is a wasteful number, since it uses less digits than its factorization.

328151221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75383.

The product of its digits is 960, while the sum is 25.

The square root of 328151221 is about 18114.9446866393. The cubic root of 328151221 is about 689.7494161141.

The spelling of 328151221 in words is "three hundred twenty-eight million, one hundred fifty-one thousand, two hundred twenty-one".