328630891 has 2 divisors, whose sum is σ = 328630892. Its totient is φ = 328630890.

The previous prime is 328630879. The next prime is 328630931. The reversal of 328630891 is 198036823.

It is an a-pointer prime, because the next prime (328630931) can be obtained adding 328630891 to its sum of digits (40).

It is a weak prime.

It is an emirp because it is prime and its reverse (198036823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328630891 - 2⁷ = 328630763 is a prime.

It is equal to p_17715595 and since 328630891 and 17715595 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (328630091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164315445 + 164315446.

It is an arithmetic number, because the mean of its divisors is an integer number (164315446).

Almost surely, 2^328630891 is an apocalyptic number.

328630891 is a deficient number, since it is larger than the sum of its proper divisors (1).

328630891 is an equidigital number, since it uses as much as digits as its factorization.

328630891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 328630891 is about 18128.1794728539. The cubic root of 328630891 is about 690.0853293618.

The spelling of 328630891 in words is "three hundred twenty-eight million, six hundred thirty thousand, eight hundred ninety-one".