328288981 has 2 divisors, whose sum is σ = 328288982. Its totient is φ = 328288980.

The previous prime is 328288969. The next prime is 328288991. The reversal of 328288981 is 189882823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247558756 + 80730225 = 15734^2 + 8985^2 .

It is a cyclic number.

It is not a de Polignac number, because 328288981 - 2⁹ = 328288469 is a prime.

It is a super-2 number, since 2×328288981² = 215547310092036722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328288991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164144490 + 164144491.

It is an arithmetic number, because the mean of its divisors is an integer number (164144491).

Almost surely, 2^328288981 is an apocalyptic number.

It is an amenable number.

328288981 is a deficient number, since it is larger than the sum of its proper divisors (1).

328288981 is an equidigital number, since it uses as much as digits as its factorization.

328288981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 49.

The square root of 328288981 is about 18118.7466729904. The cubic root of 328288981 is about 689.8459230291.

The spelling of 328288981 in words is "three hundred twenty-eight million, two hundred eighty-eight thousand, nine hundred eighty-one".