328812581 has 2 divisors, whose sum is σ = 328812582. Its totient is φ = 328812580.

The previous prime is 328812569. The next prime is 328812593. The reversal of 328812581 is 185218823.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (328812569) and next prime (328812593).

It can be written as a sum of positive squares in only one way, i.e., 274200481 + 54612100 = 16559^2 + 7390^2 .

It is a cyclic number.

It is not a de Polignac number, because 328812581 - 2¹⁰ = 328811557 is a prime.

It is a super-2 number, since 2×328812581² = 216235426847763122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328814581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164406290 + 164406291.

It is an arithmetic number, because the mean of its divisors is an integer number (164406291).

Almost surely, 2^328812581 is an apocalyptic number.

It is an amenable number.

328812581 is a deficient number, since it is larger than the sum of its proper divisors (1).

328812581 is an equidigital number, since it uses as much as digits as its factorization.

328812581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 38.

The square root of 328812581 is about 18133.1900392623. The cubic root of 328812581 is about 690.2124816447.

The spelling of 328812581 in words is "three hundred twenty-eight million, eight hundred twelve thousand, five hundred eighty-one".