328137121 has 8 divisors (see below), whose sum is σ = 353686760. Its totient is φ = 302631552.

The previous prime is 328137119. The next prime is 328137133. The reversal of 328137121 is 121731823.

It can be written as a sum of positive squares in 4 ways, for example, as 16120225 + 312016896 = 4015^2 + 17664^2 .

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 328137121 - 2¹ = 328137119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 328137121.

It is not an unprimeable number, because it can be changed into a prime (328135121) 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, 5365 + ... + 26173.

It is an arithmetic number, because the mean of its divisors is an integer number (44210845).

Almost surely, 2^328137121 is an apocalyptic number.

It is an amenable number.

328137121 is a deficient number, since it is larger than the sum of its proper divisors (25549639).

328137121 is a wasteful number, since it uses less digits than its factorization.

328137121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22035.

The product of its digits is 2016, while the sum is 28.

The square root of 328137121 is about 18114.5555010329. Note that the first 4 decimals coincide. The cubic root of 328137121 is about 689.7395369228.

Adding to 328137121 its reverse (121731823), we get a palindrome (449868944).

The spelling of 328137121 in words is "three hundred twenty-eight million, one hundred thirty-seven thousand, one hundred twenty-one".