328821187 has 2 divisors, whose sum is σ = 328821188. Its totient is φ = 328821186.

The previous prime is 328821167. The next prime is 328821197. The reversal of 328821187 is 781128823.

It is a strong prime.

It is an emirp because it is prime and its reverse (781128823) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328821187 is a prime.

It is not a weakly prime, because it can be changed into another prime (328821137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164410593 + 164410594.

It is an arithmetic number, because the mean of its divisors is an integer number (164410594).

Almost surely, 2^328821187 is an apocalyptic number.

328821187 is a deficient number, since it is larger than the sum of its proper divisors (1).

328821187 is an equidigital number, since it uses as much as digits as its factorization.

328821187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 40.

The square root of 328821187 is about 18133.4273373789. The cubic root of 328821187 is about 690.2185032277.

The spelling of 328821187 in words is "three hundred twenty-eight million, eight hundred twenty-one thousand, one hundred eighty-seven".