328342981 has 4 divisors (see below), whose sum is σ = 347657292. Its totient is φ = 309028672.

The previous prime is 328342967. The next prime is 328342991. The reversal of 328342981 is 189243823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189243823 = 41 ⋅4615703.

It can be written as a sum of positive squares in 2 ways, for example, as 264582756 + 63760225 = 16266^2 + 7985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328342981 is a prime.

It is a super-2 number, since 2×328342981² = 215618226343932722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328342951) 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, 9657130 + ... + 9657163.

It is an arithmetic number, because the mean of its divisors is an integer number (86914323).

Almost surely, 2^328342981 is an apocalyptic number.

It is an amenable number.

328342981 is a deficient number, since it is larger than the sum of its proper divisors (19314311).

328342981 is a wasteful number, since it uses less digits than its factorization.

328342981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19314310.

The product of its digits is 82944, while the sum is 40.

The square root of 328342981 is about 18120.2367810137. The cubic root of 328342981 is about 689.8837450291.

It can be divided in two parts, 3283 and 42981, that added together give a palindrome (46264).

The spelling of 328342981 in words is "three hundred twenty-eight million, three hundred forty-two thousand, nine hundred eighty-one".