321818489 has 4 divisors (see below), whose sum is σ = 330516324. Its totient is φ = 313120656.

The previous prime is 321818479. The next prime is 321818503. The reversal of 321818489 is 984818123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984818123 = 103 ⋅9561341.

It can be written as a sum of positive squares in 2 ways, for example, as 127690000 + 194128489 = 11300^2 + 13933^2 .

It is a cyclic number.

It is not a de Polignac number, because 321818489 - 2²⁴ = 305041273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321818459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4348862 + ... + 4348935.

It is an arithmetic number, because the mean of its divisors is an integer number (82629081).

Almost surely, 2^321818489 is an apocalyptic number.

It is an amenable number.

321818489 is a deficient number, since it is larger than the sum of its proper divisors (8697835).

321818489 is an equidigital number, since it uses as much as digits as its factorization.

321818489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8697834.

The product of its digits is 110592, while the sum is 44.

The square root of 321818489 is about 17939.3001257017. The cubic root of 321818489 is about 685.2835872702.

The spelling of 321818489 in words is "three hundred twenty-one million, eight hundred eighteen thousand, four hundred eighty-nine".